Patent Publication Number: US-2019182955-A1

Title: Replaceable on-package memory devices

Description:
TECHNICAL FIELD 
     Embodiments described herein relate generally to electronic device packages, and more particularly to electronic device packages with removable electronic components. 
     BACKGROUND 
     Current electronic device package technology often combines several types of electronic devices in a single package. For example, a typical server package includes a processor and memory. On-package memory, however, is not replaceable by an end user, being mounted to package substrates by “permanent” couplings such as surface mounting with solder bumps/balls or wire bonds. To provide flexibility in system memory capabilities, some server packages rely on replaceable memory that is located off-package on the server motherboard. Such replaceable memory is located off-package due to space constraints on the server package substrate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Invention features and advantages will be apparent from the detailed description which follows, taken in conjunction with the accompanying drawings, which together illustrate, by way of example, various invention embodiments; and, wherein: 
         FIG. 1A  is a perspective view of an electronic device package in accordance with an example embodiment; 
         FIG. 1B  is a top view of the electronic device package of  FIG. 1A ; 
         FIG. 1C  is an end view of the electronic device package of  FIG. 1A ; 
         FIG. 2  is a schematic end view cross-section of an electronic component module and an interconnect socket in accordance with an example embodiment; 
         FIG. 3  is a side view of the electronic component module of  FIG. 2 . 
         FIGS. 4A-4K  are end views of electronic component modules in accordance with several example embodiments; 
         FIG. 5  illustrates a method for making an electronic component module in accordance with an example embodiment; and 
         FIG. 6  is a schematic illustration of an exemplary computing system. 
     
    
    
     Reference will now be made to the exemplary embodiments illustrated, and specific language will be used herein to describe the same. It will nevertheless be understood that no limitation of the scope or to specific invention embodiments is thereby intended. 
     DESCRIPTION OF EMBODIMENTS 
     Before technology embodiments are disclosed and described, it is to be understood that no limitation to the particular structures, process steps, or materials disclosed herein is intended, but also includes equivalents thereof as would be recognized by those ordinarily skilled in the relevant arts. It should also be understood that terminology employed herein is used for the purpose of describing particular examples only and is not intended to be limiting. The same reference numerals in different drawings represent the same element. Numbers provided in flow charts and processes are provided for clarity in illustrating steps and operations and do not necessarily indicate a particular order or sequence. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. 
     As used in this written description, the singular forms “a,” “an” and “the” provide express support for plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a layer” includes a plurality of such layers. 
     In this application, “comprises,” “comprising,” “containing” and “having” and the like can have the meaning ascribed to them in U.S. Patent law and can mean “includes,” “including,” and the like, and are generally interpreted to be open ended terms. The terms “consisting of” or “consists of” are closed terms, and include only the components, structures, steps, or the like specifically listed in conjunction with such terms, as well as that which is in accordance with U.S. Patent law. “Consisting essentially of” or “consists essentially of” have the meaning generally ascribed to them by U.S. Patent law. In particular, such terms are generally closed terms, with the exception of allowing inclusion of additional items, materials, components, steps, or elements, that do not materially affect the basic and novel characteristics or function of the item(s) used in connection therewith. For example, trace elements present in a composition, but not affecting the composition&#39;s nature or characteristics would be permissible if present under the “consisting essentially of” language, even though not expressly recited in a list of items following such terminology. When using an open ended term in the written description like “comprising” or “including,” it is understood that direct support should be afforded also to “consisting essentially of” language as well as “consisting of” language as if stated explicitly and vice versa. 
     The terms “first,” “second,” “third,” “fourth,” and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Similarly, if a method is described herein as comprising a series of steps, the order of such steps as presented herein is not necessarily the only order in which such steps may be performed, and certain of the stated steps may possibly be omitted and/or certain other steps not described herein may possibly be added to the method. 
     The terms “left,” “right,” “front,” “back,” “top,” “bottom,” “over,” “under,” and the like in the description and in the claims, if any, are used for descriptive purposes and not necessarily for describing permanent relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein are, for example, capable of operation in other orientations than those illustrated or otherwise described herein. 
     The term “coupled,” as used herein, is defined as directly or indirectly connected in an electrical or nonelectrical manner. “Directly coupled” items or objects are in physical contact and attached to one another. Objects described herein as being “adjacent to” each other may be in physical contact with each other, in close proximity to each other, or in the same general region or area as each other, as appropriate for the context in which the phrase is used. 
     Occurrences of the phrase “in one embodiment,” or “in one aspect,” herein do not necessarily all refer to the same embodiment or aspect. 
     As used herein, the term “substantially” refers to the complete or nearly complete extent or degree of an action, characteristic, property, state, structure, item, or result. For example, an object that is “substantially” enclosed would mean that the object is either completely enclosed or nearly completely enclosed. The exact allowable degree of deviation from absolute completeness may in some cases depend on the specific context. However, generally speaking the nearness of completion will be so as to have the same overall result as if absolute and total completion were obtained. The use of “substantially” is equally applicable when used in a negative connotation to refer to the complete or near complete lack of an action, characteristic, property, state, structure, item, or result. For example, a composition that is “substantially free of” particles would either completely lack particles, or so nearly completely lack particles that the effect would be the same as if it completely lacked particles. In other words, a composition that is “substantially free of” an ingredient or element may still actually contain such item as long as there is no measurable effect thereof. 
     As used herein, the term “about” is used to provide flexibility to a numerical range endpoint by providing that a given value may be “a little above” or “a little below” the endpoint. 
     As used herein, a plurality of items, structural elements, compositional elements, and/or materials may be presented in a common list for convenience. However, these lists should be construed as though each member of the list is individually identified as a separate and unique member. Thus, no individual member of such list should be construed as a de facto equivalent of any other member of the same list solely based on their presentation in a common group without indications to the contrary. 
     Concentrations, amounts, sizes, and other numerical data may be expressed or presented herein in a range format. It is to be understood that such a range format is used merely for convenience and brevity and thus should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. As an illustration, a numerical range of “about 1 to about 5” should be interpreted to include not only the explicitly recited values of about 1 to about 5, but also include individual values and sub-ranges within the indicated range. Thus, included in this numerical range are individual values such as 2, 3, and 4 and sub-ranges such as from 1-3, from 2-4, and from 3-5, etc., as well as 1, 2, 3, 4, and 5, individually. 
     This same principle applies to ranges reciting only one numerical value as a minimum or a maximum. Furthermore, such an interpretation should apply regardless of the breadth of the range or the characteristics being described. 
     Reference throughout this specification to “an example” means that a particular feature, structure, or characteristic described in connection with the example is included in at least one embodiment. Thus, appearances of the phrases “in an example” in various places throughout this specification are not necessarily all referring to the same embodiment. 
     Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In this description, numerous specific details are provided, such as examples of layouts, distances, network examples, etc. One skilled in the relevant art will recognize, however, that many variations are possible without one or more of the specific details, or with other methods, components, layouts, measurements, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail but are considered well within the scope of the disclosure. 
     Example Embodiments 
     An initial overview of technology embodiments is provided below and specific technology embodiments are then described in further detail. This initial summary is intended to aid readers in understanding the technology more quickly but is not intended to identify key or essential features of the technology nor is it intended to limit the scope of the claimed subject matter. 
     Server packages with non-replaceable on-package memory cannot be easily upgraded with increased memory capabilities. As a result, an entire server package must be replaced in order to upgrade system memory, which is not cost-effective. Although server packages that utilize off-package memory do provide flexibility in configuring system memory, locating server package memory on the server motherboard may be problematic by raising space and thermal management issues on the motherboard. In addition, off-loading memory from the server package negates advantages provided by a self-contained server package that includes memory with a processor. 
     Accordingly, electronic device packages are disclosed that provides for on-package memory that is user replaceable to enable flexibility in system memory capabilities. In one example, an electronic device package in accordance with the present disclosure can comprise a package substrate. The electronic device package can also comprise a processor mounted on the package substrate. Additionally, the electronic device package can comprise a memory socket mounted on the package substrate and operably coupled to the processor. The memory socket can be operable to removably couple with a memory module or unit and facilitate electrical communication between the processor and the memory module or unit. A memory module can comprise a plurality of printed circuit boards (PCBs). Each PCB can have a bottom edge and a plurality of contact pads located about the bottom edge. Additionally, the memory module can comprise a memory device mounted on at least one of the plurality of PCBs and electrically connected to at least one of the pluralities of contact pads to facilitate electrically coupling the memory module with an external electronic component, such as a processor. Associated systems and methods are also disclosed. 
     Referring to  FIGS. 1A-1C , an exemplary electronic device package  100  is illustrated.  FIG. 1A  shows the package  100  in a perspective view,  FIG. 1B  shows the package  100  in a top view, and  FIG. 1C  shows the package  100  in an end view. The package  100  can include a package substrate  110 . The package  100  can also include one or more electronic components  120  ( FIG. 1B ) mechanically and electrically coupled to (e.g., mounted on) the substrate  110 . In the illustrated embodiment, the electronic component  120  is hidden from view by a heat spreader  121 , which can be disposed at least partially about the electronic component  120 . 
     The electronic component  120  can be any electronic device or component that may be included in an electronic device package, such as a semiconductor device (e.g., a die, a chip, a processor, computer memory, a platform controller hub, etc.). In one embodiment, some of the electronic components may represent a discrete chip, which may include an integrated circuit. The electronic components may be, include, or be a part of a processor (e.g., a CPU, a GPU, etc.), a computer memory device (e.g., ROM, SRAM, DRAM, flash memory, EEPROM, etc.), an application specific integrated circuit (ASIC), a platform controller hub (PCH), a field programmable gate array (FPGA), a modem, a system on a chip (SOC), a system in a package (SIP), or a package on a package (POP) in some embodiments. An electronic component can be any passive electronic device or component, such as a capacitor, resistor, etc. It should be recognized that any suitable number of electronic components can be included. 
     The package substrate  110  may be of any suitable construction or material. For example, the substrate  110  may include typical substrate materials. In some embodiments, the substrate  110  may be configured as an epoxy-based laminate substrate having a core and/or build-up layers. The substrate  110  may be configured as other suitable types of substrates in other embodiments. For example, the substrate can be formed primarily of any suitable semiconductor material (e.g., a silicon, gallium, indium, germanium, or variations or combinations thereof, among other substrates), one or more insulating layers, such as glass-reinforced epoxy, such as FR-4, polytetrafluoroethylene (Teflon), cotton-paper reinforced epoxy (CEM-3), phenolic-glass (G3), paper-phenolic (FR-1 or FR-2), polyester-glass (CEM-5), ABF (Ajinomoto Build-up Film), any other dielectric material, such as glass, or any combination thereof, such as can be used in printed circuit boards (PCBs). In some embodiments, the substrate  110  can be constructed primarily of silicon and/or may be configured as an interposer or a redistribution layer (RDL). 
     The electronic component  120  can be electrically coupled to the package substrate  110  according to a variety of suitable configurations including a flip-chip configuration, wire bonding, and the like. The electronic component  120  can be electrically coupled to the substrate  110  using interconnect structures (e.g., solder balls or bumps and/or wire bonds) configured to route electrical signals between the electronic component  120  and the substrate  110 . In some embodiments, the interconnect structures may be configured to route electrical signals such as, for example, I/O signals and/or power or ground signals associated with the operation of the electronic components. In one aspect, multiple electronic components can be in a stacked relationship, for example, to save space and enable smaller form factors. It should be recognized that any suitable number of electronic components can be included in a stack. At least some of the stacked electronic components can be wirebond based or flip chip integrated circuits (e.g., ASIC, DRAM, and NAND). Such integrated circuits can be electrically coupled to one another by wirebond connections or solder bumps or solder balls. 
     The package substrate  110  may include electrically conductive elements or electrical routing features (not shown) configured to route electrical signals to or from electronic components. The electrical routing features may be internal (e.g., disposed at least partially within a thickness of the substrate  110 ) and/or external to the substrate  110 . For example, in some embodiments, the substrate  110  may include electrical routing features such as pads, vias, and/or traces configured to receive the interconnect structures and route electrical signals to or from electronic components. The pads, vias, and traces can be constructed of the same or similar electrically conductive materials, or of different electrically conductive materials. Any suitable electrically conductive material can be utilized, such as copper, gold, etc. In some embodiments, the substrate  110  can include a solder resist material or other surface treatment forming an outer layer of the substrate. Interconnect structures, such as contact pads or solder balls, can be coupled to a suitable surface of the substrate  110  to facilitate electrically coupling the package  100  with an external electronic component, such as a next level component (e.g., a substrate or circuit board such as a motherboard) for power and/or signaling. In the illustrated embodiment, contact pads (identified generally at  111  in  FIG. 1B ) can be located in an interconnect region  112  of the substrate  110 , which can be inserted into an interconnect socket (e.g., a slot) of a next level component. 
     In addition, the electronic device package  100  can include one or more interconnect sockets  130   a - d  and one or more electronic component modules  140   a - d . The interconnect sockets  130   a - d  can be mounted on the package substrate  110  and operably coupled to the electronic component  120 . The interconnect sockets  130   a - d  can be operable to removably couple with the electronic component modules  140   a - d  and facilitate electrical communication between the electronic component  120  and the modules  140   a - d . For example, the interconnect sockets  130   a - d  can be configured to provide signals and/or power to electronic component modules  140   a - d . It should be recognized that the package  100  can include any suitable number of interconnect sockets, which may include multiple interconnect sockets that can be the same or different from one another. In addition, the package  100  can include any suitable number of electronic component modules, may include multiple electronic component modules that can be the same or different from one another. In some embodiments, the number of interconnect sockets may exceed the number of electronic component modules. Electronic component modules can have different capabilities and attributes, which can enable flexibility in the configuration of the package  100 . 
     The interconnect socket  130   a - d  can be mounted to the package substrate  110  in any suitable location of the electronic device package  100 . In general, an interconnect socket can be located wherever there is available “real estate” on the package substrate  110  and that will accommodate the presence of an electronic component module  140   a - d . For example, as shown in  FIGS. 1A-1C , the interconnect sockets  130   a - d  can be located on a top side of the package substrate  110  and positioned laterally relative to the electronic component  120  and associated heat spreader  121 , which may also be located on the top side of the substrate  110 . In some embodiments, as shown in  FIGS. 1A-1C , the interconnect sockets  130   a - d  can be proximate lateral sides of the package substrate  110  and thus be located “outboard” the electronic component  120 . Such a configuration can facilitate effective thermal management of the electronic component  120  and the electronic component modules  140   a - d . Thermal management of the electronic device package  100  can be designed to provide separate thermal solutions for the electronic component  120  and the electronic component modules  140   a - d  or to combine thermal solutions for the electronic component  120  and one or more of the electronic component modules  140   a - d.    
     Each interconnect socket  130   a - d  can include two or more slot receptacles configured to receive and couple with a module  140   a - d . This is illustrated in  FIG. 2  for a representative interconnect socket  130  and a representative electronic component module  140 . The slot receptacles  131   a ,  131   b  can be at least partially formed by a connector housing  136 . Thus, multiple slot receptacles can be formed in a single connector housing. The connector housing  136  can be constructed of any suitable material, such as a polymer and/or a metal. In one aspect, slot receptacles  131   a ,  131   b  of the interconnect socket  130  can have contact terminals to electrically couple with the module  140 . For example, the slot receptacle  131   a  can include contact terminals  132   a ,  133   a , and the slot receptacle  131   b  can include contact terminals  132   b ,  133   b . A contact terminal can be formed of any suitable conductive material, such as a metal (e.g., copper, gold, steel, etc.). 
     The interconnect socket  130  can be mounted to a package substrate in any suitable manner. For example, the interconnect socket  130  can include leads  134   a ,  135   a ,  134   b ,  135   b  configured as pins that extend from or are otherwise electrically coupled to the respective contact terminals  132   a ,  133   a ,  132   b ,  133   b  of the interconnect socket  130 . The leads  134   a ,  135   a ,  134   b ,  135   b  and/or contact terminals  132   a ,  133   a ,  132   b ,  133   b  can be at least partially supported by the housing  136 . The leads  134   a ,  135   a ,  134   b ,  135   b  can be configured to extend at least partially into one or more vias of a substrate and be electrically coupled to the vias by soldering. Thus, the interconnect socket  130  can be through-hole mounted to a package substrate. In one embodiment, the interconnect socket  130  can be surface mounted to a package substrate. For example, leads can be configured to contact one or more pads of a substrate and be electrically coupled to the pads by soldering. The interconnect socket  130  can therefore be mechanically and electrically coupled to (e.g., mounted on) a package substrate in any suitable manner. 
     With further reference to  FIG. 2 , the electronic component module  140  can include two or more module substrates  141   a ,  141   b . The electronic component module  140  can also include one or more electronic components  150  mechanically and electrically coupled to (e.g., mounted on) at least one of the module substrates. In the illustrated embodiment, the electronic component  150  is directly mounted on and supported by the module substrate  141   a . One or more electronic components  150  can be as described above with reference to the electronic component  120 . Similarly, the module substrates  141   a ,  141   b  can be as described above with reference to the package substrate  110 . Thus, a module substrate can include any suitable electrically conductive element or electrical routing feature and one or more electronic components can be mechanically and electrically coupled to a module substrate in any suitable manner and utilizing any suitable interconnect structure, such as surface mounting (e.g., a flip-chip configuration), wire bonding, through-hole mounting, etc. In the illustrated embodiment, the electronic component  150  is mounted on the module substrate  141   a  in a flip chip configuration, with solder bumps or solder balls  151  coupled to pads  142   a  on one side of the module substrate  141   a.    
     In one aspect, the electronic component module  140  can include an interposer  160  to facilitate coupling the module substrates  141   a ,  141   b  to one another and/or facilitate coupling the electronic component  150  to one of the module substrates  141   a ,  141   b . In the embodiment illustrated in  FIG. 2 , the interposer  160  is disposed between the module substrates  141   a ,  141   b  and operable to mechanically and electrically couple the module substrates  141   a ,  141   b  to one another. An interposer can have any suitable configuration or construction. In some respects, an interposer can utilize materials and be constructed in a manner similar to the package substrate  110  discussed above, for example, utilizing silicon material and interconnect structures such as pads, vias, and/or traces. Accordingly, an interposer can include any suitable electrically conductive element or electrical routing feature and can be mechanically and electrically coupled to a module substrate or electronic component in any suitable manner and utilizing any suitable interconnect structure, such as surface mounting, wire bonding, through-hole mounting, etc. In the illustrated embodiment, the interposer  160  can include pads  161 ,  162  on opposite sides of the interposer  160 , which can be mechanically and electrically coupled to pads  143   a ,  142   b  of the respective module substrates  141   a ,  141   b  with solder bumps or solder balls  163 ,  164 . The interposer  160  can include vias  165  electrically coupled to the pads  161 ,  162  on opposite sides of the interposer  160  to electrically couple the module substrates  141   a ,  141   b . In the illustrated embodiment, the module substrates  141   a ,  141   b  are arranged in a side-by-side stack configuration with the interposer  160  disposed between the module substrates  141   a ,  141   b.    
     The module substrates  141   a ,  141   b  can be configured to facilitate electrically coupling the module  140  with the interconnect socket  130 . In one aspect, the module substrates  141   a ,  141   b  can include interconnect structures configured to interface with the contact terminals  132   a ,  133   a  and  132   b ,  133   b  of the respective slot receptacles  131   a ,  131   b . For example, the module substrate  141   a  can include contact pads  144   a ,  145   a  (sometimes referred to as “pins”) located about a bottom edge  149   a . The bottom edge  149   a  can be configured to be disposed (i.e., inserted) in the slot receptacle  131   a , and the contact pads  144   a ,  145   a  can be configured to interface with the contact terminals  132   a ,  133   a  of the slot receptacle  131   a . Similarly, the module substrate  141   b  can include contact pads  144   b ,  145   b  located about a bottom edge  149   b . The bottom edge  149   b  can be configured to be disposed (i.e., inserted) in the slot receptacle  131   b , and the contact pads  144   b ,  145   b  can be configured to interface with the contact terminals  132   b ,  133   b  of the slot receptacle  131   b . The bottom edges  149   a ,  149   b  of the module substrates  141   a ,  141   b  can be oriented in the same direction to facilitate simultaneous insertion of the bottom edges  149   a ,  149   b  into the respective slot receptacles  131   a ,  131   b . A contact pad can be formed of any suitable conductive material, such as a metal (e.g., copper, gold, steel, etc.). 
     It should be recognized that a single module substrate can have any suitable number of contact pads, which may include more than one connector type or configuration, such as a protrusion, a receptacle, a pad, and/or any other suitable type of electrical contact for interfacing with an interconnect feature of an interconnect socket. In one aspect, multiple or groups of contact pads can be located on each side of the module substrates  141   a ,  141   b . For example,  FIG. 3  shows a group  152  of contact pads  144   a  located about the bottom edge  149   a  on an outer side of the module substrate  141   a  on which the electronic component  150  is mounted. In light of  FIGS. 2 and 3 , it should be recognized that a group of contact pads  145   a  can be located on an opposite, inner side of the module substrate  141   a . In addition, a group of contact pads  144   b  can be located on an inner side of the module substrate  141   b , and a group of contact pads  145   b  can be located on an opposite, outer side of the module substrate  141   b.    
     With further reference to  FIG. 2 , the module substrates  141   a ,  141   b  can include electrically conductive elements or electrical routing features configured to electrically couple the electronic component  150  to the contact pads  144   a ,  145   a  and  144   b ,  145   b . For example, interconnect structures and routing features such as pads  142   a , vias  146   a , and traces  147   a  of the module substrate  141   a  can be configured to facilitate electrically coupling the electronic component  150  to the contact pads  144   a ,  145   a  of the module substrate  141   a . Interconnect structures and routing features such as pads  142   a ,  143   a  and vias  148   a  of the module substrate  141   a  can be configured to facilitate electrically coupling the electronic component  150  to the contact pads  144   b ,  145   b  of the module substrate  141   b . In addition, interconnect structures and routing features such as pads  142   b , vias  146   b , and traces  147   b  of the module substrate  141   b  can be configured to facilitate electrically coupling the electronic component  150  to the contact pads  144   b ,  145   b  of the module substrate  141   b . The vias  146   a ,  146   b  can be “blind” vias that terminate at the respective traces  147   a ,  147   b . The via  148   a  can be a “through” via (e.g., a through silicon via (TSV)) that extends completely through a thickness of the module substrate  141   a  for communication with the interposer  160 , which is sandwiched between the module substrates  141   a ,  141   b . The via  165  of the interposer  160  can also be a “through” via that extends completely through a thickness of the interposer  160  for communication with the module substrate  141   b . Thus, in the illustrated embodiment, the electronic device  150  can be electrically connected to all of the contact pads  144   a ,  145   a  and  144   b ,  145   b  of the respective module substrates  141   a ,  141   b . In one aspect, different groups of contact pads (e.g., contact pads on opposite sides of a module substrate) can be electrically distinct from one another (e.g., as with dual inline memory module (DIMM) connectors). 
     In some embodiments, the electronic component module  140  can include multiple electronic components. For example, the electronic component module  140  can include electronic component  150 ′ in addition to the electronic component  150 . In one example, the electronic component  150 ′ can be mounted on the module substrate  141   b . In one aspect, two or more electronic components of an electronic component module can be electrically coupled to one another, as indicated at  153  in  FIG. 2 . 
     The module substrates  141   a ,  141   b  can be spaced apart from one another by any suitable distance  170 . In some embodiments, the distance  170  can be from about 1 mm to about 4 mm. In the illustrated embodiments, the distance  170  can be established by a thickness  171  of the interposer  160  and by any thickness attributable to the interconnect structures coupling the interposer  160  and the module substrates  141   a ,  141   b , such as the pads  143   a ,  161 ,  162 ,  142   b  and solder balls or bumps  163 ,  164 . 
     In some embodiments, spacers  166 ,  167  can be included to provide additional mechanical stability for coupling the interposer  160  and one or more of the module substrates  141   a ,  141   b . The spacers  166 ,  167  can be secured to the adjacent components in any suitable manner, such as with an adhesive. A thickness of the spacers  166 ,  167  can be configured to provide a desired distance  170  between the module substrates  141   a ,  141   b . The spacers  166 ,  167  can be constructed of any suitable material, such as silicon, a polymer, a metal, etc. Any suitable number of spacers can be included in any suitable configuration. 
     The housing  136  can be configured to provide a center-to-center distance  172  between the slot receptacles  131   a ,  131   b  to facilitate coupling with the module substrates  141   a ,  141   b . The distance  172  can be based on the distance  170  and thicknesses of the  173   a ,  173   b  of the respective module substrates  141   a ,  141   b . Although it may be desirable to minimize the distances  170 ,  172 , manufacturing and practical considerations for the electronic component module  140  and/or the interconnect socket  130  may dictate suitable distances  170 ,  172  that can be achieved. In some cases, the space occupied by the contact terminals  132   a ,  132   b  of the respective slot receptacles  131   a ,  131   b  and associated housing structure may dictate minimum distances  170 ,  172  that can be achieved. 
     Due to the nature of the mechanical connections between the interposer  160  and the module substrates  141   a ,  141   b , manufacturing tolerances for these connections can impact the ability of the module substrates  141   a ,  141   b  to be inserted into the mating slot receptacles  131   a ,  131   b  and form effective electrical connections between the contact pads on the module substrates and the contact terminals in the slot receptacles. Suitable tolerances on the distance  170  can be up to about +/−0.25 mm. Suitable tolerances on the distance  172  can be up to about +/−0.25 mm. 
     Even with such tolerances, mating the module substrates  141   a ,  141   b  in the slot receptacles  131   a ,  131   b  may be difficult to achieve without some degree of mechanical interference that can cause stress in the interposer/module substrate connections that can lead to failure of the electronic component module  140 . Accordingly, lower portions of the module substrates  141   a ,  141   b  extending from the interposer/module substrate connections can be configured to provide some flexibility or compliance that allows the lower portions of the module substrates  141   a ,  141   b  to bend or deflect in response to mechanical interference with the slot receptacles and therefore reduce stress that may be induced in the interposer/module substrate connections. 
     In one aspect, one or more of the module substrates  141   a ,  141   b  can include features to ensure proper coupling with the interconnect socket  130 . Such features may be commonly found in DIMMs and mating sockets. For example, as shown in  FIG. 3 , the module substrate  141   a  can include a polarization notch  180  to ensure proper orientation and placement of the module substrates  141   a ,  141   b  in the slot receptacles  131   a ,  131   b . A polarization key (not shown) can be included in the slot receptacle  131   a . In some embodiments, locking features, such as locking notches  181 ,  182 , can be included in one or more of the module substrates  141   a ,  141   b  to facilitate securing the electronic component module  140  to the interconnect socket  130  to prevent unwanted separation. A locking tab (not shown) can be coupled to the housing  136  and configured to interface with the locking notches  181 ,  182 . In one aspect, one or more of the bottom edges  149   a ,  149   b  can be ramped, as known in the art, to reduce the required insertion force when coupling the electronic component module  140  with the interconnect socket  130 . 
     In some embodiments, the electronic component  150  can be a computer memory device (e.g., ROM, SDRAM, DRAM, flash memory, EEPROM, etc.). Accordingly, the electronic component module  140  may be referred to as a memory module and the interconnect socket  130  may be referred to as a memory socket. In addition, the electronic component  120  may be, include, or be a part of a processor (e.g., a CPU, a GPU, etc.). In this case, the memory module may be utilized by the processor. In some embodiments, the package  100  can comprise a server package. 
     The present technology disclosed herein can enable replacement or customization of various electronic components of a package. For example, in the case of a server package, on-package memory can be replaced or expanded as desired to customize performance. Thus, the memory capabilities can be customized or upgraded without the need to replace the entire package, which includes one or more processors. Replaceable on-package memory can therefore provide system configuration flexibility with less expense. 
     In one aspect, interconnecting features of the electronic component module  140  and interconnect socket  130  can be configured similar to those commonly found in DIMMs and mating sockets. For example, as shown in  FIG. 3 , the contact pads  144   a  at the bottom edge  149   a  of the module  140  can be configured similar to the pads or pins of a DIMM. Therefore, the electronic component module  140  and interconnect socket  130  can be manufactured in accordance with current low cost, high volume PCB fabrication tolerances, surface mount, and signal routing capabilities. For example, a 0.4 mm pitch  174  between adjacent contact pads  144   a  over a contact length  175  of 30 mm can provide 76 contact pads  144   a . Configuring the contact pads  145   a ,  144   b , and  145   b  with the same pitch and contact length can provide a total of 304 contact pads for the electronic component module  140 . This number of contact pads is roughly the amount of interconnect structures currently utilized by typical DDR4 memory technology but is provided in a smaller area. As a result, the present technology can increase interconnector (e.g., pin or pad) count density compared to typical DIMM connectors. Thus, the electronic component module  140  and socket  130  can provide a memory module and socket that can fit in a relatively small space, such as on a server package. In the embodiment illustrated in  FIGS. 1A-1C , memory modules can be compact enough that four removable memory modules can fit on a single, space-constrained server package. In addition, by utilizing an edge connector and slot type interconnection, installation and serviceability is similar to board DIMMs that users are familiar with, and serviceability is improved when compared with on-package memories that are located under the CPU heat sink. 
     The configuration of the electronic component module  140  has two module substrates  141   a ,  141   b  separated by the interposer  160 , with the electronic component  150  mounted directly on an outer side of the module substrate  141   a . It should be recognized that any suitable configuration of module substrates, electronic components and, optionally, interposers can be utilized in an electronic component module in accordance with the present disclosure. Several examples of electronic component module configurations are illustrated in  FIGS. 4A-4K . These configurations are not intended to be limiting in any way but, instead, illustrate the wide variety of ways that module substrates, electronic components and, optionally, interposers can be configured in accordance with the present technology. Specific configurations most suitable for a given application may depend on cooling solutions and signal routing considerations. 
       FIG. 4A  shows an electronic component module  240 . In this case, an electronic component  250  is disposed between two module substrates  241   a ,  241   b , with no interposer. The electronic component  250  is directly mechanically and electrically coupled to the module substrates  241   a ,  241   b  and performs at least some of the same function as the interposer  160  of  FIG. 2 . The electronic component module  240  is one example of a module that includes only, or exactly, two module substrates. 
       FIG. 4B  shows an electronic component module  340 . In this case, an electronic component  350  and an interposer  360  are disposed between two module substrates  341   a ,  341   b . The electronic component  350  is directly mechanically and electrically coupled to the interposer  360  and the module substrate  341   a . The electronic component  350  is electrically coupled to the module substrate  341   b  through the interposer  360 . 
       FIG. 4C  shows an electronic component module  440 . In this case, an electronic component  450  is disposed between two interposers  460   a ,  460   b . The electronic component  450  and interposers  460   a ,  460   b  are between two module substrates  441   a ,  441   b . The electronic component  450  is directly mechanically and electrically coupled to the interposers  460   a ,  460   b . The electronic component  350  is electrically coupled to the module substrates  441   a ,  441   b  through the respective interposers  460   a ,  460   b.    
       FIG. 4D  shows an electronic component module  540 . In this case, an electronic component  550   a  and an interposer  560  are disposed between two module substrates  541   a ,  541   b , with an electronic component  550   b  disposed on an outer side of the module substrate  541   a . The electronic component  550   b  and the interposer  560  are disposed on opposite sides of the same module substrate  541   a . The electronic component  550   a  is directly mechanically and electrically coupled to the interposer  560  and the module substrate  541   b . The electronic component  550   a  can be electrically coupled to the module substrate  541   a  through the interposer  560 . The electronic component  550   b  is directly mechanically and electrically coupled to the module substrate  541   a . The electronic component  550   b  can be electrically coupled to the module substrate  541   b  through the module substrate  541   a , the interposer  560 , and the electronic component  550   a . The electronic components  550   a ,  550   b  are in direct contact with, and mounted on, different module substrates but can be in electrical communication with one another as facilitated by the interposer  560 . 
       FIG. 4E  shows an electronic component module  640 . In this case, an electronic component  650   a  and an interposer  660  are disposed between two module substrates  641   a ,  641   b , with an electronic component  650   b  disposed on an outer side of the module substrate  641   a . The electronic component  650   a  is directly mechanically and electrically coupled to the module substrate  641   a  and the interposer  660 . The electronic component  650   a  can be electrically coupled to the module substrate  641   b  through the interposer  660 . The electronic component  650   b  is directly mechanically and electrically coupled to the module substrate  641   a . The electronic component  650   b  can be electrically coupled to the module substrate  641   b  through the module substrate  641   a , the electronic component  650   a  and the interposer  660 . The electronic components  650   a ,  650   b  are in direct contact with, and mounted on, opposite sides of the same module substrate  641   a  and can be in electrical communication with one another. 
       FIG. 4F  shows an electronic component module  740 . In this case, two electronic components  750   a ,  750   b  are arranged in a stack configuration and disposed between two module substrates  741   a ,  741   b , without an interposer. Although two electronic components are illustrated in a stack, it should be recognized that any suitable number of electronic components can be included in a stack. The electronic component  750   a  is directly mechanically and electrically coupled to the electronic component  750   b  and the module substrate  741   a . The electronic component  750   b  is directly mechanically and electrically coupled to the electronic component  750   a  and the module substrate  741   b . The electronic component  750   a  can be electrically coupled to the module substrate  741   b  through the electronic component  750   b . The electronic component  750   b  can be electrically coupled to the module substrate  741   a  through the electronic component  750   a . The electronic components  750   a ,  750   b  can be in electrical communication with one another. 
       FIG. 4G  shows an electronic component module  840 . In this case, an interposer  860  is disposed between two electronic components  850   a ,  850   b . The electronic components  850   a ,  850   b  and interposer  860  are between two module substrates  841   a ,  841   b . The electronic component  850   a  is directly mechanically and electrically coupled to the module substrate  841   a  and the interposer  860 . The electronic component  850   b  is directly mechanically and electrically coupled to the module substrate  841   b  and the interposer  860 . The electronic component  850   a  can be electrically coupled to the module substrate  841   b  through the interposer  860  and the electronic component  850   b . The electronic component  850   b  can be electrically coupled to the module substrate  841   a  through the interposer  860  and the electronic component  850   a . The electronic components  850   a ,  850   b  can be in electrical communication with one another. 
       FIG. 4H  shows an electronic component module  940 . In this case, an electronic component  950   a  and an interposer  960  are disposed between two module substrates  941   a ,  941   b , with an electronic component  950   b  disposed on an outer side of the module substrate  941   a  and an electronic component  950   c  disposed on an outer side of the module substrate  941   b . The electronic component  950   a  is directly mechanically and electrically coupled to the module substrate  941   a  and the interposer  960 . The electronic component  950   a  can be electrically coupled to the module substrate  941   b  through the interposer  960 . The electronic component  950   b  is directly mechanically and electrically coupled to the module substrate  941   a . The electronic component  950   b  can be electrically coupled to the module substrate  941   b  through the module substrate  941   a , the electronic component  950   a , and the interposer  960 . The electronic component  950   c  is directly mechanically and electrically coupled to the module substrate  941   b . The electronic component  950   c  can be electrically coupled to the module substrate  941   a  through the module substrate  941   b , the interposer  960 , and the electronic component  950   a . The electronic components  950   a ,  950   b  are in direct contact with opposite sides of the same module substrate  941   a . Any of the electronic components  950   a - c  can be in electrical communication with one another through the module substrates  941   a ,  941   b , the electronic component  950   a , and/or the interposer  960 , as applicable. 
       FIG. 4I  shows an electronic component module  1040 . In this case, electronic components  1050   a - c  are arranged in a stack configuration and disposed between two module substrates  1041   a ,  1041   b , without an interposer, with an electronic component  1050   d  disposed on an outer side of the module substrate  1041   a  and an electronic component  1050   e  disposed on an outer side of the module substrate  1041   b . The electronic components  1050   a - c  in a stack can be mechanically and electrically coupled to one another. The electronic component  1050   a  is directly mechanically and electrically coupled to the electronic component  1050   b  and the module substrate  1041   a . The electronic component  1050   c  is directly mechanically and electrically coupled to the electronic component  1050   a  and the module substrate  1041   b . The electronic component  1050   d  is directly mechanically and electrically coupled to the module substrate  1041   a . The electronic component  1050   e  can be electrically coupled to the module substrate  1041   b  through the module substrate  1041   a  and the stack of electronic components  1050   a - c . The electronic component  1050   e  is directly mechanically and electrically coupled to the module substrate  1041   b . The electronic component  1050   e  can be electrically coupled to the module substrate  1041   a  through the module substrate  1041   b  and the stack of electronic components  1050   a - c . The electronic components  1050   a ,  1050   d  are in direct contact with opposite sides of the same module substrate  1041   a . The electronic components  1050   c ,  1050   e  are in direct contact with opposite sides of the same module substrate  1041   b . Any of the electronic components  1050   a - e  can be in electrical communication with one another through the module substrates  1041   a ,  1041   b  and/or any of the electronic components  1050   a - c , as applicable. 
       FIG. 4J  shows an electronic component module  1140 . In this case, an interposer  1160  is between or forming a bridge connecting two module substrates  1141   a ,  1141   b , with a stack of multiple electronic components  1150   a - b  disposed on an outer side of the module substrate  1141   a  and a stack of multiple electronic components  1150   c - d  disposed on an outer side of the module substrate  1141   b . The electronic components  1150   a - b  in a stack can be mechanically and electrically coupled to one another. Any of the electronic components  1150   a - b  in a stack can be electrically coupled to the module substrate  1141   b  through the module substrate  1141   a  and the interposer  1160 . The electronic components  1150   c - d  in a stack can be mechanically and electrically coupled to one another. Any of the electronic components  1150   c - d  in a stack can be electrically coupled to the module substrate  1141   a  through the module substrate  1141   b  and the interposer  1160 . Any of the electronic components  1150   a - d  can be in electrical communication with one another through the module substrates  1141   a ,  1141   b , the interposer  1160 , the electronic component  1050   b , and/or the electronic component  1050   c , as applicable. 
       FIG. 4K  shows an electronic component module  1240 . In this case, the electronic component module  1240  includes three or more module substrates  1241   a - c . An interposer  1260   a  is between module substrates  1241   a ,  1241   b , and an interposer  1260   b  is between module substrates  1241   b ,  1241   c . An electronic component  1250   a  is disposed on an outer side of an outermost module substrate  1241   a  and an electronic component  1250   b  is disposed on an outer side of an outermost module substrate  1241   c . The electronic components  1250   a ,  1250   b  are directly mounted on different module substrates but can be electrically coupled to one another or any of the module substrates  1241   a - c  through the module substrates  1241   a - c  and/or the interposers  1260   a ,  1260   b , as applicable. Additional module substrates can be utilized as desired to fit an electronic component module within a given space and/or achieve a desired interconnect density. Any number of module substrates can be included in a stack of module substrates, limited only by practical considerations, such as tolerances, heat dissipation, etc. 
       FIG. 5  illustrate aspects of exemplary methods or processes for making an electronic component module, such as the electronic component module  140 . In one aspect, the method can be utilized to make a memory module. The method can comprise obtaining a first printed circuit board (PCB) having a first bottom edge and a first plurality of contact pads located about the first bottom edge  1390 . The method can also comprise obtaining a second PCB having a second bottom edge and a second plurality of contact pads located about the second bottom edge  1391 . Additionally, the method can comprise mounting a memory device on at least one of the first and second PCBs such that the memory device is electrically connected to at least one of the first plurality of contact pads and the second plurality of contact pads to facilitate electrically coupling the memory module with an external electronic component  1392 . In one aspect, the method can comprise disposing an interposer between the first PCB and the second PCB. It is noted that no specific order is required in this method, though generally in one embodiment, these method steps can be carried out sequentially. 
       FIG. 6  schematically illustrates an example computing system  1401 . The computing system  1401  can include an electronic device package  1400  as disclosed herein, operably coupled to a motherboard  1402 . In one aspect, the computing system  1401  can also include a processor  1403 , a memory device  1404 , a radio  1405 , a cooling system (e.g., a heat sink and/or a heat spreader)  1406 , a port  1407 , a slot, or any other suitable device or component, which can be operably coupled to the motherboard  1402 . The computing system  1401  can comprise any type of computing system, such as a desktop computer, a laptop computer, a tablet computer, a smartphone, a server, a wearable electronic device, etc. Other embodiments need not include all of the features specified in  FIG. 6 , and may include alternative features not specified in  FIG. 6 . 
     Examples 
     The following examples pertain to further embodiments. 
     In one example, there is provided a memory module comprising a plurality of printed circuit boards (PCBs), each having a bottom edge and a plurality of contact pads located about the bottom edge, and a memory device mounted on at least one of the plurality of PCBs and electrically connected to at least one of the pluralities of contact pads to facilitate electrically coupling the memory module with an external electronic component. 
     In one example of an electronic device package, the memory device is disposed between two of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is electrically and mechanically coupled to the two of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is mounted to the at least one of the plurality of PCBs by surface mounting, wire-bonding, through-hole mounting, or a combination thereof. 
     In one example, an electronic device package comprises an interposer disposed between two of the plurality of PCBs. 
     In one example of an electronic device package, the interposer is electrically and mechanically coupled to the two of the plurality of PCBs. 
     In one example of an electronic device package, the interposer is electrically and mechanically coupled to the two of the plurality of PCBs by surface mounting, wire-bonding, through-hole mounting, or a combination thereof. 
     In one example of an electronic device package, the memory device is disposed between two of the plurality of PCBs. 
     In one example of an electronic device package, the memory device and the interposer are disposed on opposite sides of a same one of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is directly mounted to the two of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is disposed on an outermost one of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is disposed on an outer side of the outermost one of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is electrically connected to all of the pluralities of contact pads. 
     In one example of an electronic device package, the plurality of PCBs are arranged in a side-by-side stack configuration. 
     In one example of an electronic device package, the bottom edges of the plurality of PCBs are oriented in a same direction. 
     In one example of an electronic device package, the memory device comprises a plurality of memory devices. 
     In one example of an electronic device package, two of the plurality of memory devices are mounted on two different PCBs. 
     In one example of an electronic device package, the two different PCBs are outermost of the plurality of PCBs. 
     In one example of an electronic device package, the two memory devices are disposed on outer sides of the two outermost of the plurality of PCBs. 
     In one example of an electronic device package, the plurality of PCBs comprises only the two outermost PCBs. 
     In one example, an electronic device package comprises an interposer disposed between the two PCBs. 
     In one example of an electronic device package, two of the plurality of memory devices are mounted on a same PCB. 
     In one example of an electronic device package, the two of the plurality of memory devices are mounted on opposite sides of the same PCB. 
     In one example of an electronic device package, two of the plurality of memory devices are arranged in a stack configuration. 
     In one example of an electronic device package, two of the plurality of memory devices are electrically coupled to one another. 
     In one example of an electronic device package, the plurality of PCBs comprises exactly two PCBs. 
     In one example of an electronic device package, the plurality of PCBs comprises three or more PCBs. 
     In one example of an electronic device package, the memory device comprises DRAM, SDRAM, or a combination thereof. 
     In one example of an electronic device package, the plurality of contact pads comprises a first group of contact pads on one side of the PCB and a second group of contact pads on an opposite side of the PCB. 
     In one example of an electronic device package, the first group of contact pads and the second group of contact pads are electrically distinct from one another. 
     In one example of an electronic device package, two of the plurality of PCBs are spaced apart by a distance of from about 1 mm to about 4 mm. 
     In one example, there is provided an electronic device package comprising a package substrate, a processor mounted on the package substrate, and a memory socket mounted on the package substrate and operably coupled to the processor, the memory socket being operable to removably couple with a memory module and facilitate electrical communication between the processor and the memory module. 
     In one example of an electronic device package, the memory socket comprises a plurality of memory sockets. 
     In one example of an electronic device package, the package comprises a server package. 
     In one example, an electronic device package comprises a heat spreader disposed at least partially about the processor. 
     In one example of an electronic device package, the memory socket comprises a slot receptacle configured to receive and couple with the memory module. 
     In one example of an electronic device package, the slot comprises a plurality of slots, each slot having a plurality of contact terminals. 
     In one example, an electronic device package comprises the memory module. 
     In one example of an electronic device package, the memory module comprises a plurality of printed circuit boards (PCBs), each having a bottom edge and a plurality of contact pads located about the bottom edge, wherein the bottom edge is configured to be disposed in one of the plurality of slots and the plurality of contact pads is configured to interface with the plurality of contact terminals, and a memory device mounted on at least one of the plurality of PCBs and electrically connected to at least one of the pluralities of contact pads to facilitate electrically coupling the memory module with the processor. 
     In one example of an electronic device package, the memory device is disposed between two of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is electrically and mechanically coupled to the two of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is mounted to the at least one of the plurality of PCBs by surface mounting, wire-bonding, through-hole mounting, or a combination thereof. 
     In one example, an electronic device package comprises an interposer disposed between two of the plurality of PCBs. 
     In one example of an electronic device package, the interposer is electrically and mechanically coupled to the two of the plurality of PCBs. 
     In one example of an electronic device package, the interposer is electrically and mechanically coupled to the two of the plurality of PCBs by surface mounting, wire-bonding, through-hole mounting, or a combination thereof. 
     In one example of an electronic device package, the memory device is disposed between two of the plurality of PCBs. 
     In one example of an electronic device package, the memory device and the interposer are disposed on opposite sides of a same one of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is directly mounted to the two of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is disposed on an outermost one of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is disposed on an outer side of the outermost one of the plurality of PCBs. 
     In one example of an electronic device package, the memory device is electrically connected to all of the pluralities of contact pads. 
     In one example of an electronic device package, the plurality of PCBs are arranged in a side-by-side stack configuration. 
     In one example of an electronic device package, the bottom edges of the plurality of PCBs are oriented in a same direction. 
     In one example of an electronic device package, the memory device comprises a plurality of memory devices. 
     In one example of an electronic device package, two of the plurality of memory devices are mounted on two different PCBs. 
     In one example of an electronic device package, the two different PCBs are outermost of the plurality of PCBs. 
     In one example of an electronic device package, the two memory devices are disposed on outer sides of the two outermost of the plurality of PCBs. 
     In one example of an electronic device package, the plurality of PCBs comprises only the two outermost PCBs. 
     In one example, an electronic device package comprises an interposer disposed between the two PCBs. 
     In one example of an electronic device package, two of the plurality of memory devices are mounted on a same PCB. 
     In one example of an electronic device package, the two of the plurality of memory devices are mounted on opposite sides of the same PCB. 
     In one example of an electronic device package, two of the plurality of memory devices are arranged in a stack configuration. 
     In one example of an electronic device package, two of the plurality of memory devices are electrically coupled to one another. 
     In one example of an electronic device package, the plurality of PCBs comprises exactly two PCBs. 
     In one example of an electronic device package, the plurality of PCBs comprises three or more PCBs. 
     In one example of an electronic device package, the memory device comprises DRAM, SDRAM, or a combination thereof. 
     In one example of an electronic device package, the plurality of contact pads comprises a first group of contact pads on one side of the PCB and a second group of contact pads on an opposite side of the PCB. 
     In one example of an electronic device package, the first group of contact pads and the second group of contact pads are electrically distinct from one another. 
     In one example of an electronic device package, two of the plurality of PCBs are spaced apart by a distance of from about 1 mm to about 4 mm. 
     In one example, there is provided a computing system comprising a motherboard and an electronic device package operably coupled to the motherboard, the electronic device package comprising a package substrate, a processor mounted on the package substrate, and a memory socket mounted on the package substrate and operably coupled to the processor, the memory socket being operable to removably couple with a memory module and facilitate electrical communication between the processor and the memory module. 
     In one example of a computing system, the computing system comprises a desktop computer, a laptop, a tablet, a smartphone, a server, a wearable electronic device, or a combination thereof. 
     In one example of a computing system, the computing system further comprises a processor, a memory device, a cooling system, a radio, a slot, a port, or a combination thereof operably coupled to the motherboard. 
     In one example, there is provided a method for making a memory module comprising obtaining a first printed circuit board (PCB) having a first bottom edge and a first plurality of contact pads located about the first bottom edge, obtaining a second PCB having a second bottom edge and a second plurality of contact pads located about the second bottom edge, and mounting a memory device on at least one of the first and second PCBs such that the memory device is electrically connected to at least one of the first plurality of contact pads and the second plurality of contact pads to facilitate electrically coupling the memory module with an external electronic component. 
     In one example of a method for making an electronic device package, the memory device is disposed between the first PCB and the second PCB. 
     In one example of a method for making an electronic device package, the memory device is electrically and mechanically coupled to the first PCB and the second PCB. 
     In one example of a method for making an electronic device package, the memory device is mounted to the at least one of the first PCB and the second PCB by surface mounting, wire-bonding, through-hole mounting, or a combination thereof. 
     In one example, a method for making an electronic device package comprises disposing an interposer between the first PCB and the second PCB. 
     In one example of a method for making an electronic device package, the interposer is electrically and mechanically coupled to the first PCB and the second PCB. 
     In one example of a method for making an electronic device package, the interposer is electrically and mechanically coupled to the first PCB and the second PCB by surface mounting, wire-bonding, through-hole mounting, or a combination thereof. 
     In one example of a method for making an electronic device package, the memory device is disposed between the first PCB and the second PCB. 
     In one example of a method for making an electronic device package, the memory device and the interposer are disposed on opposite sides of the first PCB or the second PCB. 
     In one example of a method for making an electronic device package, the memory device is directly mounted to the first PCB and the second PCB. 
     In one example of a method for making an electronic device package, the memory device is disposed on an outer side of the first PCB or the second PCB. 
     In one example of a method for making an electronic device package, the memory device is electrically connected to the first plurality of contact pads and the second plurality of contact pads. 
     In one example of a method for making an electronic device package, the first PCB and the second PCB are arranged in a side-by-side stack configuration. 
     In one example of a method for making an electronic device package, the first bottom edge and the second bottom edge are oriented in a same direction. 
     In one example of a method for making an electronic device package, the memory device comprises a plurality of memory devices. 
     In one example of a method for making an electronic device package, one of the plurality of memory devices is mounted on the first PCB and another of the plurality of memory devices is mounted on the second PCB. 
     In one example of a method for making an electronic device package, the two memory devices are disposed on outer sides of the first PCB and the second PCB. 
     In one example, a method for making an electronic device package comprises disposing an interposer between the first PCB and the second PCB. 
     In one example of a method for making an electronic device package, two of the plurality of memory devices are mounted on the first PCB or the second PCB. 
     In one example of a method for making an electronic device package, the two of the plurality of memory devices are mounted on opposite sides of the first PCB or the second PCB. 
     In one example of a method for making an electronic device package, two of the plurality of memory devices are arranged in a stack configuration. 
     In one example of a method for making an electronic device package, two of the plurality of memory devices are electrically coupled to one another. 
     In one example of a method for making an electronic device package, the memory device comprises DRAM, SDRAM, or a combination thereof. 
     In one example of a method for making an electronic device package, the first plurality of contact pads comprises a first group of contact pads on one side of the first PCB and a second group of contact pads on an opposite side of the first PCB. 
     In one example of a method for making an electronic device package, the first group of contact pads and the second group of contact pads are electrically distinct from one another. 
     In one example of a method for making an electronic device package, first PCB and the second PCB are spaced apart by a distance of from about 1 mm to about 4 mm. 
     Circuitry used in electronic components or devices (e.g. a die) of an electronic device package can include hardware, firmware, program code, executable code, computer instructions, and/or software. Electronic components and devices can include a non-transitory computer readable storage medium which can be a computer readable storage medium that does not include signal. In the case of program code execution on programmable computers, the computing devices recited herein may include a processor, a storage medium readable by the processor (including volatile and non-volatile memory and/or storage elements), at least one input device, and at least one output device. Volatile and non-volatile memory and/or storage elements may be a RAM, EPROM, flash drive, optical drive, magnetic hard drive, solid state drive, or other medium for storing electronic data. Node and wireless devices may also include a transceiver module, a counter module, a processing module, and/or a clock module or timer module. One or more programs that may implement or utilize any techniques described herein may use an application programming interface (API), reusable controls, and the like. Such programs may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) may be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language, and combined with hardware implementations. 
     While the forgoing examples are illustrative of the specific embodiments in one or more particular applications, it will be apparent to those of ordinary skill in the art that numerous modifications in form, usage and details of implementation can be made without departing from the principles and concepts articulated herein.