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At current prices the 8800GTS is a decent buy, but if you overclock don't expect to reach 9800GTX speeds, the memory on most 8800GTS's is pretty awful, and thats really what lets them down.

Eh?
I ran my 8800GTS 512mb at 830/1945/2200 24/7
Loads of GTS's reached GTX speeds, are right around it.
But i am thinking of upgrading to a 24" screen soon once ive got this new rig together.