That's a big jump.
That parallel stuff....2xgt.....might turn out to be a big headache.
Make sure you have a psu that can handle that card.
I have 1 gt 640 and i play cod4 and looking into upgrading my video. What would be better?
How fast would 2 dual Nvidia gt 640 vs 1 Nvidia gtx 660 ti be?
I run a ok 250fps on my 1 gt 640 now but with a super low config file and rez set to 1440.