Either that or just flash the BIOS of the 6850 to make it the 6870.
not gonna happen, ever
i dnt think i can get a hd 6870.....i'm stuck between gtx 460 and hd 6850
just look at the games you're playing. if most of the game you play favors nvidia cards then geforce is your choice. if its the other way around then pick radeon.