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CMX256A-3200C2 won't do 2 3 3 6


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I have a pair of CMX256A-3200C2 running in my P4P800, and today, I loaded up CPU-Z and noticed that the auto settings for my motherboard was running them at 2.5 3 3 8. So I loaded up my motherboard Bios, set it to manual and set the timings as 2 3 3 6. My motherboard was not able to boot at these settings, and even though it managed to get to the windows loading screen once, it crashed two seconds into that.


I reset my CMOS and now have them running at 2.5 3 3 8 again, but I would like them to run at the correct settings. The only thing that I am overclocking in my system is my videocard, the FSB is still at 200.

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  • Corsair Employees

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) or NVIDIA (5200 or 5700) 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

Memory Acceleration Mode: Auto

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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I figured out the problem, one of my sticks is defective, I tested it in another machine and it had the same problem. Tried another piece of RAM in the same slot just in case, and it worked like a charm.


I have it sitting beside me right now in a cardboard box, what is the best thing to store it in until I can send it back?

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