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Bad Memory Module

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Unstable system with reboots, freezes.


Originally system was VERY stable. After about a year I started getting reboots about 1/wk which were blamed on my graphics card (RMA'd to ATI, supposdly a known problem).


New graphics card, fresh XP install, reboots continued and then progressed to 1/day and then within 2 days the system no longer boots past the XP loading screen, often crashes during that.


Ran memtest86, errors reported on Test 4.


Can I safely presume that since memtest reported errors starting with Test 4 that I have a faulty chip and should RMA it?



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  • Corsair Employees
Can you tell me the exact model# of your memory module and the make and model of MB you have along with the CPU speed and it’s FSB as well? In addition, please tell me if you have the latest BIOS installed on your system and the bios settings you have set for both CPU and memory and any performance settings that you may have set?
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Sorry, after all the times I've listed my system info in the past few days I keep assuming I must have already told everyone by now.


The stick in question is CMX512-3200C2. I have two, memtest reports errors on one only.


For MOBO I have ASUS P4P800 and ASUS P4C800-E DELUXE (I upgraded the motherboard inbetween these problems since I was trying to eliminate the problem). The BIOS in both has been upgraded to the latest 1018 version from the Asus website.


The processor is a P4 3GHz 800FSB.


No overclocking has EVER been done. All settings are at AUTO in the BIOS for voltages/timings/etc.


Suggestions what to try besides bad RAM? I've upgraded the MOBO, swapped the PSU, "borrowed" a friends CPU. Still crashes randomlly.


Is it common for a memory to "go bad" after being in service for almost a year with little to no trouble?

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Please make sure that you have the latest BIOS for your MB and load Setup/optimized default settings, and try the following BIOS settings;

TwinX1024 or TwinX512-3200C2

Advanced/Jumper Free

AI over clocking: Manual

CPU Freq: 200

DRAM Clock: 400 MHz

Memory or Dim Reference voltage: 2.75 Volts

System performance: Auto

AGP Voltage: Default *unless you have ATI 9200 or 9600 then 1.6 Volts suggested!*


Configure Dram timing by SPD: Disabled/User define

SDRAM CAS Latency: 2T (2.5T AMD Platform)

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Row Precharge (tRP): 3T

SDRAM Active to Precharge Delay (tRAS): 6T

SDRAM Burst Length: 8

Performance Acceleration Mode: Enabled

USB Legacy Support: Disabled

All other settings should be set to default settings!

Then please test them one at a time with http://www.memtest.org and let’s make sure it's not some other issue! I would run the test for at least 2-3 passes to be sure!

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