Palit Sonic Platinium GTX 460(800/4000) scores 61 FPS .
We will see but Ati can do that much magic, i mean you think that a 960SP card will equal an 1440SP( 6850= 5850? ) , and 1120SP = > 1600SP( 5870) ?
I don't think so.
I think that 6850 performance will be between GTX 460 768MB an 1GB closer to 1gb version( between 5830 an 5850), and 6870 will be above GTX 460 1GB an slightly above 5850 more or less, so between 5850 and 5870.