Intel D975XBX and Geil DDR2-800 compatibility


I have an Intel D975XBX board (mb rev 304, bios rev 5/26/06) with a Core2 Duo E6600. I have 2 x 512 MB Geil DDR2-800 CL 5 modules. When I set the BIOS to use the memory at 800 MHz, memtest86 always locks up in the middle of the test at around 34% completion [This is when it just starts the memory move tests]. In addition, the Windows setup also locks up in the middle. However, if I set the BIOS to run the memory at 667 MHz, then everything works fine.

Has anyone else run into a similar problem? Is there some known compatibility issue between the Geil memory and D975XBX? Or does this behavior mean that there is some problem in the motherboard or memory?

Also, CPU-Z is showing the memory's SPD data as 667 MHz (even if I set the BIOS to run the memory at 800 MHz). Could that be simply because the D975XBX does not officially support 800 MHz or is this some real problem?

I would really appreciate any help in this regard.

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  1. Thanks for the suggestion. The memory voltage was set to Automatic. I just tried with a setting of 2.1 V and now it is passing memtest86. It even works with 1.9 V. But the Geil website for this memory module says that the needed voltage is 1.8 V ( Does the D975XBX always need a higher voltage for running DDR2-800? Or is this just a problem with the combination of this board and the Geil memory?

  2. Oh, I didn't know that. But Geil specifies the memory as 1.8V on their website. Could it be that the Geil specs are simply incorrect? Also, do you know why is the SPD data showing it as DDR2-667 ?

    Basically, my concern is whether I have a defective module, or is this just a matter of incorrect specs from Geil. Has anyone else been able to use this memory at 1.8V and/or seen the correct SPD data?

    Thanks for the help

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