[quote]would be nice to know if crossfire works with a 1Gb 5870 and a 2GB 5870 so u can use the 2GB vram but save some money.
I am pretty sure that wont be the case, unless they make a change. If you had a 512 4870 and a 1 gig 4870 they would both only use 512.
Yeah, as the contents of the VRAM are mirrored between cards (unless ATi have done some awesome tricks with their memory management and card communication in the new gen cards) then if you pair two cards with different amounts of VRAM, they'll only use the amount the lowest capacity card possesses.