Are you saying 2 (yes this is 2 not 1) 560 TI cant play games maxed @ 1920x1200? And that 1gb is enough for a single GTX580?

1920x1200:
Crysis Warhead 1393mb
Dragon age 2 1115mb
Metro 2033 1443mb
Napoleon Total War 1235mb
Total war shogun 2 1547mb
The witcher 2 1152mb
http://forums.overclockers.co.uk/sho...php?t=18284509

And personally ive seen 1790mb usage so far in BF3

Look at this too:
http://www.xtremesystems.org/forums/...y-at-1920x1200