Did you overclock ram too? You cant just turn up the fsb you also need to turn up the ram freqency. just for reference I have E6600 and as well but with the Freezer 7 Pro cooler with Asus Striker Extreme board and also crappy 667 RAM. I get 3.4 Ghz up to stable but I keep at 3.33Ghz for safety purposes? Do you have aftermarket cooler or stock cooler.