Talk:SO-DIMM

message: There is a new version, ddr2 sodimm. I bought it for a ddr sodimm laptop and it is incompatible. Maybe some information should be added. (-someone)
Agreed. There should be info on what type of memory is supported. I.E: a 266mhz is backward compatible with 133mhz but other are not... is that the case?
DDR or DDR2 are not backward compatible with other kinds. PC133 is not compatible with Intel 440xx and 810 chipset using PC100. (-someone)
Usually the situation is more complex.  Usually within a type, the faster modules are SOMETIMES backwards compatible.  Often the problem is with "chip density" -- when the module is faster AND built with denser chips, maybe for greater total capacity, then it may not work in older slots designed earlier. 69.87.193.203 21:41, 26 November 2006 (UTC)
thread_title:  Compatibility with different types of memory 

message: I demand information on DDR and DDR2 SODIMMs!--66.3.224.199 21:00, 7 October 2006 (UTC)
thread_title:  DDR/DDR2 

message: We need pictures of each type, with a ruler and at the same scale, so people see the notches etc. 69.87.193.203 21:37, 26 November 2006 (UTC)
thread_title: pictures

message: The different types of SO-DIMMs can be recognized at a glance by the distinctive notches used to "key" them for different applications: 100-pin SO-DIMMs have two notches, 144-pin SO-DIMMs have a single notch near (but not at) the center, and 200-pin SO-DIMMs have a single notch nearer to one side.
 
This is to a degree incorrect, I have a 16mb RAM stick in a Digital Hi-Note VP and a 64mb stick in a Toshiba Tecra 8000, the sticks ARE NOT compatable even though they both have 1 notch, they are about 1mm from aligning with each other. It is a possiblity that Digital used propriatry RAM but I have no idea as the laptop is probbably older than I am, and it was given to me freely without any manual etc :(
* Additional comments in section below on trying to identify chips. 24.143.11.227 (talk) 19:01, 23 December 2019 (UTC)
thread_title: identifying memory (was 'correction')

message: As of 11/19, regarding the two pictures used to illustrate the distinguishing different notch locations for DDR and DDR2 memory.    The article says the notch is closer to the center for the DDR2 memory.  In the pictures don't the notches appear to be in the same location relative to the sides of the memory?  If the DDR2 memory picture really is of DDR2 memory then there actually isn't much difference in notch location.
Gloryroad (talk) 17:08, 18 November 2007 (UTC)
replies: text: I note that the DDR picture has been removed since these comments were added.  It would be useful for those of us attempting to distinguish the two types if it (or an equivalent) could be returned.  I'm not sure why it was removed, but I'd say it's definitely an informative addition to the article. JulesH (talk) 17:25, 8 September 2009 (UTC)
thread_title:  DDR and DDR2 pictures - notches 

message: Is there any difference between DR2 5300 SO-DIMM that is recommended for Mac (mini), versus for any PC (based laptop)?  —Preceding unsigned comment added by 63.193.121.240 (talk) 02:38, 8 December 2008 (UTC)
thread_title:  DDR2 (5300) - Mac vs. PC versions 

message: "At the time of writing (May 2008) DDR2 SO-DIMM memory modules commonly have clock speeds from 200 MHz up to 800 MHz PC2-6400 and 1066 MHz PC2-8500 are becoming available." as stated at the bottom of the article is a year ago. I don't know the outdated template code, so I came here to discuss it instead. Any input?--Airplaneman (talk) 23:34, 21 May 2009 (UTC)
replies: text: Generally speaking, per WP:V, if the assertion has no source, you may feel free to remove it, or consider tagging it  as a courtesy to allow other editors a bit of time to find a source should they want to retain the claim in the article.  Claims that remain should, over time, be cited with inline citations. N2e (talk) 21:34, 3 October 2009 (UTC)
thread_title:  Hmmm, should I remove? 

message: From the standard-setting point of view, a minute difference in notch position (say, 0.3 mm) is enough to prevent insertion of a memory module in an incompatible motherboard. Notch position was not designed to facilitate module identification. Worse, the vendors do not always provide on the label the information you need to determine whether the module is compatible with your system.
Never try to insert a module with the wrong key. If it is not seated properly you could have a hundred short circuits and your motherboard will smoke.
The best way to determine what kind and how much memory your computer can use is to go to a vendor such as Kingston Technology or Crucial Technology and use the memory advisor link on their home page. This does not obligate you to buy from Kingston or Crucial.
Since there is so much confusion, and so many readers are trying to use Wikipedia to identify memory modules, perhaps we should mention this in the various articles on memory modules. Yes, I know it is not exactly "encyclopedic", being shopping advice. Solo Owl (talk) 04:04, 25 October 2009 (UTC)
thread_title:  Advice to readers trying to identify memory