I've been following this thread for two weeks, but only got post privileges today...

SuperMicro H8QG6-F motherboard, integrated video, bios version 1?, bios date April 2010, supermicro sc484 chassis, 4x opteron 6172 (2.1ghz), 64gb ecc ram, 2k8 server R2 trial (64-bit). $9 cpu heatsinks (startech fank8am2) from microcenter, modified to fit width.

wprime 2.03, 1024m test with 48 threads:
Best: 52.353 seconds.
Usual: 53 - 54 seconds.

wprime 1.55, 1024m test with 48 threads:
Best: 52.103 seconds
Usual: 52.5 - 54 seconds

cinebench 11.5 set to 48 threads:
Best cpu test: 24.99
Usual: 24.52 - 24.94

I'm not sure how many threads cinebench is running. Cinebench insists that there are 32 cores in the system. I manually set the preferences to 48 threads, but if I check the preferences a second later, it's back at 32 threads. So i'm not sure if the cinebench results are based on 32 or 48 threads.

Based on another thread, I tried the k10stat program. No go. I eventually figured out that you can only oc the engineering samples.