So, I've read over and over again that ACC doesn't do anything on Phenom II chips. Blocking out all of those bad thoughts, I decided to give it a try...

The problem: Core 3 on my PII 940 does not clock over 3.5Ghz

Research to discover the problem: Setting each core to 3.7Ghz via AOD, one by one then running Prime95 64-bit set to 8k FFTs with 1600MB of ram allocated.

Core 0: No problem
Core 1: No problem
Core 2: No problem
Core 3: Cannot even get into prime before the system reboots.

Attempted solutions:
1) more vcore - no luck
2) lower memory ratio - no luck
3) lower overall clock - lame, but works
4) *ACC

I started by setting ACC to 0% on all but core 3, which I set to +2%. I rebooted the system, and set the clock. Hmm...Interesting...I can set that clock without almost instantly rebooting. So I thinks to myself, this seems promising. I kick off prime, it runs for a few seconds then reboots. Feeling a bit more lucky, I decided to kick it up another notch to 4%. Whadya know, I've gotten through 10 passes of this test without any issues so far.

Did the optimizations for ACC in recent bios revisions do something for ACC that does actually make it effective?

--Matt