Originally Posted by
CryptiK
The QPI multiplier is not denoted as '24x' in the bios, and its not permanently stuck on 24x either. When you choose one of the 4 QPI speed choices this sets the QPI multiplier accordingly. If you have the QPI speed set to what equates to 24x, it will reach 8000MT/s at 166 BLCK. If you run lower Vtt, this may not be quite reachable, it is on my CPU's/board but my CPU's have excellent IMC's and my board does 240 BCLK, however it still will not post at over 8000MT/s. 200 BCLK isn't aggressive for a 975 IMO, many decent C0's did 220+ BCLK.
What is your uncore speed at when you can't boot? Keep this under 3800 MHz or so, unless you want to run higher Vtt. What you can set this too depends on how good the IMC is and how much Vtt you are comfortable running. At 1.30 Vtt, you probably wont get it stable much over 3600MHz.
Also keep in mind there's quite a bit of difference between what you set in BIOS and real voltage, eg: set 1.32500v BIOS for Vtt and I get 1.250v load. If you are at 1.30 Vtt BIOS, you are probably around 1.23 Vtt real.
80*C is hotter than I like my CPU's to run, but I'm on water, for air and a fairly high voltage, most people seem to think 80*C is acceptable for stress testing apps (real world apps wont push it that hard). Your speed of around 4.2GHz is fine, just optimize your uncore and ram speed/timings and you have a quick system.
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