Unfortunately Core #1 (numbered 0 through 3) dies above 3.8GHz at any voltage and quickly too. Since temps are already 80C (175F) !! I prefer to keep that where it is. Took me 5 days to stabilize this rig, I'm done doing that. This is a development rig for my office which I will be using to build an app that takes over an hour to compile/link on an Opteron 248 (2.2GHz) system. I expect that time to be around 20 minutes with this new hardware. Keys to stabilizing were:

1. running memtest to find the memory stable settings (DDR3-1640 8-7-7-20-2T), anything over that was failing frequency-wise.

2. running prime95 small FFT to isolate the CPU's potential, which seems to be 3.8GHz (this is pretty lame because other people have gotten to 4.0 GHz, so I think I got a bad CPU, but it's still well within engineering tolerance, I suspect).

3. upping voltage on the FSB and MCH, FSB at +.30V locked up the system; MCH at +.40 locked up the system.

4. setting the CPU drive to 900mV

5. Manually setting all the secondary memory timings to be one higher than the auto selection was, i.e. 5 became 6.

The Scythe Mugen heatsink is so large it rests on coils too, which may be preventing it from getting the tightest fit possible on the CPU... 80C seems pretty excessive even at 1.38750V to me. Then again I am used to water cooling (see sig) and this doesn't have it.