What are you using to monitor your temps? When you say "load" how are you stress testing? Download OCCT 3.0.1 and run a custom test, with a LARGE DATASET, HIGH PRIORITY, and CHECK the box for Hyperthreading. Run it for 1hr and report back how hot that bad boy gets. It will run all 8 Hyperthreading cores at 100% and beat the crap out of it. This will be a true test.
I am OCed to 4.GHz with a Thermalright u-120 eXtreme cooler. I sit at about 55C idle across all cores, and max at about 85C.
RealTemp gives me a reading about 3C cooler than OCCT does though. So in that perspective its about 52C idle and 82C max.