Soldato
The 2GB and 4GB versions of the gtx670 get identical performance at that resolution.
Even top end cards can struggle at 2560x1440 but it's not because of lack of vram.
ive got 2 x 470's in SLI and have been running a few older games past this monitor,
Metro2033 does seem to struggle just a tiny bit, im getting 29fps, and it seems a little choppy,
just about to test Crysis 2 to see how it looks with the high res texture pack