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Bad XMS4000 256MB memory stick


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I have what seems like a bad XMS4000 256MB memory stick. I bought the TWINX set of two equal sticks, and only one of them works. If I put both modules in the computer only one of them works, ie. I've got only 256MB of RAM. If I put in only the the good stick, I've got 256 MB ok, if I put only the bad one, the machine does not boot. I have a Gigabyte SIS655 based motherboard. The memory has not been abused in any way and hardly been used.


Now what do I do ? As fas as I understand you do have a lifetime warranty which means I am covered, right ?


Howewer I'd like to swap them into the TWINX512-3200XL if possible.




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  • Corsair Employees
Can you tell me the make and model of MB you have along with the CPU speed and it’s FSB as well? In addition, please tell me the bios settings you have set for both CPU and memory and any performance settings that you may have set?
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Hi, the machine does not boot with the bad stick, so it is not possible to test it separately.


I have a Gigabyte 8SQ800 Ultra MB. It is presently running at 150Mhz FSB with a P4 2,553 at 2,8 Ghz. The memory is running at 400Mhz with 2,6 volts, which is the maximum memory voltage with this MB. I have also tried with stock settings at 133Mhz FSB and 333Mhz memory speeds but with the same result. The memory timings are "automatic" and set at 3-3-3-6.



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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 TwinX512-4000 (Ctrl + F1)

Frequency Voltage Control

CPU Freq: 133

DRAM Clock: 133 or 166 MHz

CPU:DRAM ratio: 1:1 or 2:3

Memory or Dim Reference voltage: 2.75 Volts (+.2)

System performance: Standard

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: 3T

SDRAM RAS to CAS Delay (tRCD): 4T

SDRAM Row Precharge (tRP): 4T

SDRAM Active to Precharge Delay (tRAS): 8T

SDRAM Burst Length: 8

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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