Prime after ~1h has it around 89-90C
Go out and get yourself a better HSF than stock and you will be able to get that bad boy up to 4.0 GHz in no time, rock solid stable too I bet.

You can check for non-BSOD errors by going to the WCG website, login to your account and then change the Result Status filter.
http://www.worldcommunitygrid.org/ms...Time&pageNum=1