GTX 650 or GTX 275 ?

xomm

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The 275 will be faster by a decent margin. You could run the 650 as a PhysX card, but unless a game you play is has lots of PhysX effects (and even then), the extra power draw isn't really worth it.
 

amirp

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Here is a comparison of the 650 and the gtx 285
http://www.anandtech.com/bench/Product/681?vs=520

judging by that the 650 and 275 should be approximately similar in performance.

So I would use the gtx 650 as it is newer, has MUCH lower power consumption and will be cooler and quieter. Also the 275 will not be able to use direct x11.

Edit... I also agree with Cons29... you have them both, try them out and see which is best