yeah there multiplier locked. I did raise the vcore .05 v. The cooler is very good and helps a lot lol
Ive had 3.7+ on a P4D 805 over a gig overclock theres a thread on here if you fancy a search
secret is i dropped the ram (667) to 533 the overclock to 3 gig then raises the ram back up to 667
so only the cpu is overclocked (on the E6600)