the 6970 has eyefinity
the 570 has physx
it really depends on what type of chipset you have I guess. If you have a AMD mobo get a AMD card and vice versa.
edit: I'm not sure if this helps but I would rather get the 6950 and save about...$80.
Last edited by Henreh; 03-08-2011 at 06:48 PM.