Yea i realise you wrote at the top that card figured when u wrote at the bottom you were going to be using 2 good cards you mite be open to suggestion of a better card the price difference is only about $100 a card but theres also a 1gb model.
Someone here posted that "NDA"ed reviews have been done on HD5850 and 1 has been leaked.
They're testing it on C2Q Q9650, 4GB 1066
1920x1080, DX10, Ultra High, 4x AA and 16x AF.
The results were Min. 34 Avg. 47 Max. 56