I'm not interested in dealing with any extra heat, so avoided OCing to past the maximum for stock volts. Quite a few people have had success with stock volt on 3.6GHz with the 955, but my maximum is 3.5GHz and that's now my 24/7. Actually, I just updated my mobo BIOS to v1.5 from v1.4, so I think I'll try and see if I can get 3.6 stable on stock volts, but I doubt it. I'll enable ACC to keep the cores stable and see if it helps.
I was never interested in pushing to breaking point though, budget is too tight for that.:p