I'm not a gamer, so I'm treading into not familiar territory here, but you may be able to use your 8800GTS as a physics card with a newer video card. I think it works with a Crossfire or SLI board.
Quote:
In multi-GPU mode, one GPU handles all graphics duties, while the second card is solely responsible for tackling all physics commands. Under this mode end users can mix and match different cards. For instance, someone who purchased a GeForce 8800 GT last year can run this card for physics, and then pick up a brand new GeForce GTX 280 to run as the primary graphics card for gaming. An SLI motherboard isn’t required for this mode either, both SLI and non-SLI motherboards are supported.
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Not sure how well it works but it looks interesting.
http://www.firingsquad.com/hardware/...ance/page2.asp