I tried 1.25, 1.3 and 1.35v on the QPI, they dont do much to improve stability over 200 BCLK.
However, I never touched the IOH voltage, I would assume that might help.
When I tried 2000 Mhz on the ram, I had the QPI set to 1.4v+, and the ram at 1.65v, going by the XMP profile, and 10-10-10-30 timings with T3. It couldnt even boot into windows.
I dont know if anyone has gotten 12 gigs stable on any board at 2000 Mhz or more, 12 Gb seems to be limited to around 1800 Mhz, regardless of how good the ram is.
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