d0 doesn't necessarily mean you can get more out of it, it just means you can possibly get the same out of it with lower temps and possibly lower voltages. I have a DFI lanparty with a c0 stepping at 4.0ghz and I can't get it any higher. I've personally only seen up to 4.3ghz on air cooling and I can imagine that would take a lot of tweaking. I imagine 44c is idle temp not load temp? And is that CPU temp or CORE temp? If you need more help may I suggest you post in the official overclocking thread :)
Also keep in mind that 4.2ghz from an original 2.66 is a pretty insane overclock.
yea. at the moment i have it overclocked at 4.2ghz 43-45C idle and 50C load (according to real temp). it is watercooled and have the extreme heat sink on and the watercooling plugged in to that too, all stable
i have seen people get 4.5-4.7 out of an intel i7 920 on air, mines watercooled so surly it can do more, i just dont know the settings to get more out of it. i have tried over n over but the comp doesnt load up when it fails to overclock.
i used the PDF guide thats out on the net that gigabyte did using all the same components as what i have with the gigabyte extreme mobo only thing different is i have a D0 and not a C stepping like it is in the guide.
I hope you aren't using the voltage for QPI they have mentioned lol. On my board it is at 1.26v and my 4.0ghz oc is stable. Ok well start from the beginning I guess. You are saying you overclocked your RAM to 1600mhz from 1333? If so, I say drop your RAM multiplier back one setting, then crank up your bclk some more, see what happens. Oh, and dont forget to change the uncore multiplier so its 2xRAM or 2x +1 :) Might have to touch your core voltage up just a tad if you are currently using the 1.4v that gigabyte recommend in their guide. Also, if you haven't already, turn off hyperthreading. It's not really that beneficial in gaming, only benchmarking and video encoding. That should add some stability.
