UnOfficial Asus Rampage II Extreme Thread

[tristan20]

anyone can help me out here, I just put my machine together, asus extreme ii with latest 903 bios, intel 920, memory kingston 2000 hz memory, evga 8800gtx and corsair 1000hx.

Everything set at default works fine. When I go to the bios and enable the XMP settings for the memory, it shows up and I choose profile 1. But when I save the settings, the machine boots and tells me overclocking failed.

Shouldnt the XMP settings work without anything other adjustments?

[dejanh]

anyone can help me out here, I just put my machine together, asus extreme ii with latest 903 bios, intel 920, memory kingston 2000 hz memory, evga 8800gtx and corsair 1000hx.

Everything set at default works fine. When I go to the bios and enable the XMP settings for the memory, it shows up and I choose profile 1. But when I save the settings, the machine boots and tells me overclocking failed.

Shouldnt the XMP settings work without anything other adjustments?

Yes, in theory, but as all chips past 1333MHz are outside of Intel specifications their specific support is really dependent on how well the board manufacturer has done in terms of making the given DRAM compatible with their board. Quite likely, you DRAM is not "compatible" in that sense. But, don't despair. Just set all of the settings for your DRAM manually and try it that way. You will have to set the following parameters.

QPI/DRAM voltage
DRAM voltage
DRAM timings

Refer to the specs of your DRAM for values to use here. Quite likely you will need QPI/DRAM at about 1.65V, DRAM at 1.65V, and DRAM timings at something like 9-9-9-24-2T to start.

Keep in mind that QPI/DRAM voltage past 1.35V is outside of Intel's maximum specification (see http://download.intel.com/design/pro...hts/320834.pdf, page 22, Vtta and Vttd) and that there is at least a chance that going beyond this limit may kill your chip in the long run.