Patent ID: 8446738

Claim:
A motherboard assembly, comprising; a multilayered first printed circuit board (PCB) having opposed parallel first and second surfaces, each having at least one land grid array (LGA) disposed thereon, and further having at least one wiring layer (Y) designed to only electrically interconnect components on or within the first PCB, and at least one wiring layer (X) designed to only electrically connect the components on the first PCB to a multilayered second PCB; the multilayered second PCB having opposed parallel first and second surfaces, the first surface having at least one LGA disposed thereon, and further having at least one wiring layer (V) designed to only electrically interconnect components on or within the second PCB, and at least one layer (X) designed to only electrically interconnect the components on the second PCB with the components on the first PCB; a first LGA interposer coupled to the LGA disposed on the first surface of the first PCB for electrically connecting at least one component to the first PCB; and a second LGA interposer sandwiched between and coupling to the LGA disposed on the second surface of the first PCB and to the LGA disposed on the first surface of the second PCB for electrically connecting the first PCB to components on the second PCB, wherein the at least one component comprises a plurality of concentrator modules, and wherein wiring layers for connecting the plurality of concentrator modules to each other are present only within the multilayered first PCB and are not included in the multilayered second PCB, and wherein signals on the wiring layers connecting the plurality of concentrator modules to each other are not routed through the first LGA interposer and the second LGA interposer.