Originally posted by Lsdmeasap
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I manually adjusted multipliers and found my Muskin Redline would run all the way up to 1900+ on just 1.5 v - most of the time. 1600 ran pretty well with only occasional BSOD's, perhaps every second or third day, but I could not get Windows 7 to resume from sleep no matter what I tried with memory and core voltages. I had not really researched XMP much, so I had never enabled it, but once I did, the BSOD's went away and Windows 7 would now resume from sleep.
I did try to figure out what was different about running memory at 1600 using XMP versus using my various settings, especially voltages. Finally I noticed that when XMP is enabled, QPI/Vtt is increased from 1.1 to 1.35 - see image below. I think the BIOS must just do this. I looked at Intel's specification for XMP, and there is no memory map slot for QPI voltage, only for DIMM voltage. The XMP QPI/Vtt setting appears to over-ride the AUTO setting in the main voltage adjustment page.
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