Just did since you mentioned it. It dropped the frequency from 4.3 to 4.2GHz. -Boost.Wow, big score! Have you tried the tvb option?
Put my UV back and ran the random TS Bench a few times on 1 and 12 threads. No problem there. Freezes right away if I try to change the cache ratio from 4.7 to 4.3 though.I think you just came up with a new stability test. No need to run Prime95 for hours on end torturing your CPU. To test your undervolt, just make sure you can adjust the core and cache multipliers without your computer locking up. That was the logic behind the Random option in the TS Bench test.