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Possible Bad Memory Module


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I been having system instability for a while now at 200MHz FSB on an Abit NF7-S Rev. 2.0 with two sticks of Corsair CMX256A-3200C2 XMS3202v1.2. I then turned my FSB down to 186MHz, the fastest It would run stable. Anything above that and I would get errors in Memtest86. I removed one of the sticks while running at 200MHz FSB and found that one of the sticks is unstable at that speed. Increasing the memory voltage does nothing. These tests were performed with the processor underclocked.

 

These are my BIOS settings:

 

CPU Freq: 200 MHz (400 FSB)

System Performance: User Define

Memory Frequency: 100%/1:1 ratio

Resulting Frequency: 400 MHz (400 FSB)

Memory Timing: User Define/Manual

SDRAM CAS Latency: 2.5T

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Active to Precharge Delay (tRAS): 7T

SDRAM Row Precharge (tRP): 3T

DDR Reference Voltage: 2.7 Volts

Chipset Voltage: 1.7 Volts

 

Thanks

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Let me put it another way, if you have a bad module it will fail at the same place on test 4 no matter what frequency you have it at. So the fact the module will pass at 186 MHz suggest its might be the CPU. I would test the modules with these settings 2 or 3 pass and see if the modules pass one up.

CPU Freq: 166 MHz

Memory Frequency: 100%

Dim Voltage to 2.7 Volts

Resulting Frequency: 166MHz

SDRAM CAS Latency: 2.5T

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Row Precharge (tRP): 3T

SDRAM Active to Precharge Delay (tRAS): 6T

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