I run mine in an antec 1200 case,zalman cnps9900 led cooler,O/C to 3.8
my idle temps are aroung 35'C and during heavy BFBC2 gaming I'm around 55'C MAX.My room temp is around 20'C.
and I used arctic silver ceramique.
I also run mine with none of that cool'n'quiet crap,lol.
even idling my core speed is 3.8
so i agree with simon,recheck your heatsink.