My old E6300 i could only get to 3.1ghz no matter what (P35C-DS3R)
I just bought E6550 and it fly over that, i was hurry to play so i didnt test too much, got it booting 500x7 but my memory would not cooperate and did not load to windows, anyway working steady now at 475x7 with 1,325v. not sure yet wich temps are correct but ~45c on max load.