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I don't think Battlefield 3 is very taxing really. Runs fine 1080p with Ultra settings on my 1GB AMD 6870 + i7 4770k.
Crysis 3 no contest
@1600p maxed you need 4 Titans to get over 80fps
The sli scaling is also very good, about 95% for each card you add.
Tomb Raider when you have TressFX turned on seems to be pretty GPU Intensive!