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Old 09-28-2005, 03:30 PM   #1 (permalink)
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Default RAM - how to tell

Hey,

I consider myself to be slightly above average when it comes to hardware. One of my weakpoint, something I want to fix, is Identifying RAM and the differences between. I am hoping there is maybe a comprehensive site out there, and if there is, could somebody let me know?

Thanks
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Old 09-28-2005, 03:50 PM   #2 (permalink)
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Unless they have been remarked by unscrupulous dealers that are selling substandard modules not passed for use in a computer as computer-quality, all of the chips on a particular module will have the manufacturer's name (or logo), and a part number printed on them.

For example, a 30-pin SIMM module with nine chips on the module, could have the part number - KM41C4000AJ-8. Drop the AJ-8 (the first letter is usually the quality - A, B, C, etc.), then use KM41C4000 to conduct a Google search. You should be provided with links to many sites that provide information about part numbers. One of them is http://www.memoryusa.com/guide.html.

The KM indicates parts made by Samsung. The 41 indicates that it is a 1Mbit x 4 part. This means that the chip holds 4Mbits. Eight of the nine chips hold memory, so this is a 8 x 4Mbit, or 32Mbit module. There are eight bits to a byte, therefore this is an 4MB module. The ninth chip is there to add parity. This was used as a means of checking for memory errors that is no longer used.

For a 168-pin DIMM module that has eight chips (no parity chip), and the part number - TMS626812DGE-12A - you would use TMS626812 to search for information on it.

Each chip is a 2Mbit x 8 (16Mbit) SDRAM chip. There are eight chips, so this is a 16MB SDRAM module, which is slow compared to the fastest speed that SDRAM modules reached. The 12 in the part number indicates that the module has a maximum frequency (speed) of 66MHz. SDRAM modules, now superseded by DDR and Rambus RAM, reached a maximum speed of 133MHz.




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Old 09-28-2005, 03:58 PM   #3 (permalink)
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alright, thanx.
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Old 09-28-2005, 04:59 PM   #4 (permalink)
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http://www.legitreviews.com/article.php?aid=53

that'll tell you how to identify brainpower PCB...which is supposed to be the better PCB for overclocking...as for the IC's a lot of times it'd actually say TCCD on there when it's TCCD IC's and I believe TCCC says the same thing...generally though if you look at the timings you can pretty much figure out if it's TCCDs (although that has been replaced by TCC5s now) or BH-5s...generally there will be info on the web for that.

http://www.xtremesystems.org/forums/...ad.php?t=50010

that's a fairly up to date list of which RAM brands have which ICs
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