Re: Save me some time and heartache, please
I think an 8800GTS would be an improvement on his system. The 7950GX2 was faster than 7800GT SLI and I had a massive (MASSIVE) improvement going from one of those to an 8800GTX. The GTS 640Mb isn't as fast but you should see a similar improvement coming from a slower SLI setup.
Also, I'm pretty sure that the 8800GTS will work as a physx card. It should help out quite a bit when its needed. If you aren't playing any Physx games (Cryostasis, Mirrors Edge etc...) then I'd set it aside until you do play some physx games. It'll basically just be sitting in there making heat and sucking power until you need it.
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