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Go with a 512 mb ATI 2900xt, they perform almost as good as a GTX and better than a GTS for 100$ less.
Go with a 512 mb ATI 2900xt, they perform almost as good as a GTX and better than a GTS for 100$ less.
8800gts is better card, but its more expensive. You can run SLI on your board, so a nvidia card is a better choice than an ATI one if you plan on using two cards at some point.
Cheapest 2900XT on Newegg is $359 after MIR, while the cheapest 8800GTS 640 is $339 after MIR. The GTS 640 is also significantly cheaper before MIR.
To answer the OP's question, go for the 8800 GTS 640. It's faster, less expensive, and uses less power as compared to the 2900XT.
What do those prices have to do with my post?
Go with a 512 mb ATI 2900xt, they perform almost as good as a GTX and better than a GTS for 100$ less.