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Possible Faulty CMX512-3200C2PT Module


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I have two RAM modules, both with the following details on:


CMX512-3200C2PT XMS3202v4.1 0437041-17

XMS3200 512MB 400MHz CL2


I'm having problems with one of the modules (I bought second one in November 04 to upgrade to 1GB RAM)


When I install both modules at the same time my PC crashes within 20 minutes or so of playing a game (even with all the latest drivers / patches). Occassionally the PC will crash when just running applications. Games return to the desktop with error messages such as 'Cannot Read Memory at Location xxx', and sometimes the PC will just suddenly reboot itself


When I install just the first (original) module everything works fine, and the PC can run for days on end 24 hours a day without any problems. When I install just the second (new) module the PC regularly crashes (as above)


This leads me to believe the second module is faulty. Please could I therefore return the module for a replacement


My system is Athlon 3000+, AOpen AK77-600GN motherbord, NVIDIA GT6800 LE video, onboard AC97 sound


Please don't ask me to do anything too technical. Inserting and removing modules is about my technical limit!

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Thanks for the fast reply (especially given the time of year!)


The 'XMS3202v4.1 0437041-17' bit may be different, but the 'CMX512-3200C2PT...XMS3200 512MB 400MHz CL2' is identical (I specifically ordered two 'identical' modules so there would be less of a compatibility problem


I have tried installing just the second module and I get crashes and intermittent reboots, so its definitely something to do with having the second module installed, either on its own or as part of a pair

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The fact that the modules are both XMS 512 3200 does'nt mean they are the same. (identical).

Since they were purchaced at different times, they could be different Revisions.

The newer modules are rated at a CAS Latency of 2.5 on an AMD system.

The other module may be CAS 2.


You can try to manually set the timings to 2.5-3-3-6 @ 2.7 volts.

Also you may want to run Memtest to check for errors.


One more thing. Does you CPU have a 333 or 400 FSB?

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Okay, I've checked the old working module and it has 'XMS3202v2.2 0314048' but the rest is exactly the same


Sorry but I don't understand what 'You can try to manually set the timings to 2.5-3-3-6 @ 2.7 volts' means. I assume its BIOS settings. Mine are currently:


Current FSB Freq: 166MHz

Current DRAM Freq: 200 MHz

DRAM Timing: Auto

x DRAM CAS Latency: 2.5

x Bank Interleave: Disabled

x Precharge to Active (Trp): 5T

x Active to Precharge (Trans): 9T

x Active to CMD(Trcd): 5T

DRAM Burst Length: 4

DRAM Command Rate: 2T Command

Write Recovery Time: 3T

DRAM Internal WTRCMD Delay: 2T


Please would you tell me which ones to change to the settings you suggest


I couldn't see anything in the BIOS to suggest whether my CPU has 333 or 400 FSB. I think its 400 but not sure

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  • Corsair Employees

First you cannot run DDR400 with a 333FSB CPU!

Please try these settings after you load setup defaults.

Dim Voltage: 2.7 Volts

CAS Latency CL=2.5

Row Cycle Time tRC Bios Default

Row Refresh Cyc Time tRFC Bios Default

Ras# to CAS# delay tRCD 3

Row to Row delay Bios Default

Min Ras# Active Time tRAS 6

Row Precharge Time tRP 3

Write Recovery Time Bios Default

Write to Read delay Bios Default

Read to Write Delay Bios Default

Refresh Period tREF Bios Default

Then test the system with http://www.memtest.org and make sure it's stable!

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