I just ran 3d06 at 850/1100 for 21k on cf asus DK 4870 1b a e8600 never going over 50*c on cards. My secret is to run with a single 120mm fan on the outside of the cards - It has lowered my load about 25*c for about 9.99$ usd. I will crank this up a bit more when i get home from work tonight. I honestly think that these cards are fairly cpu bound at this point, and i'm already running at 4.3ghz+