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SPD Error

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I have owned a pair of half-gig XMS3200C2PT chips for a while now, which have run happily at stock. I say at stock as I don't overclock. I had one stick fail on me back in March - which you kindly replaced pretty quickly but now I think the other one has gone west on me as well.


Only recently I upgraded to a 3200 chip meaning I could (finally) run in sync @ DDR400. Or so I thought. It ran for a short time but I could tell it wasn't happy. Someone introduced me to CPU-Z as a good tool for taking snapshots of how your system is running. I discovered that one of the things CPU-Z displays is SPD timings. The stick I had replaced in March was a.o.k. but the older stick, while showing as the correct part number, showed that it was only rated @ 166Mhz?? Took the stick out and all was fine. So now, if I boot @ DDR400 set memory speed manually, it runs. (Only been running @ DDR400 for two sessions so far so fingers crossed!) If I set by SPD, it keeps falling over.


Think I've got another faulty stick. What you reckon?


Let me know.



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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

CPU Freq: 200 MHz (400 FSB)

System Performance: User Define

Memory Frequency: 100%

Resulting Frequency: 200 MHz (400 FSB)

Memory Timing: User Define

SDRAM CAS Latency: 2.5T

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Row Precharge (tRP): 3T

SDRAM Active to Precharge Delay (tRAS): 6T

DDR Reference Voltage: 2.7 Volts

AGP Voltage: Default *unless you have ATI (9200 or 9600) or NVIDIA (5200 or 5700) then 1.6 Volts suggested!*

All other settings are motherboards defaults

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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Latest mobo/bios already flashed. Have already run Memtest86 when started getting problems after you replaced the 1st stick; no reported errors after being on for approx 3 hours (not sure how many passes). However, will run again just to be certain and post back results.


Re memory timings; can't select cas2.5 as an option - cas 2 or 3 only. Am I not right in saying the memory, when @ 200Mhz, is set up to run at 8-3-3 cas 3 anyway? Even so, given I can't select Cas 2.5, what timings should I be running please?


Cheers :biggrin:

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