ATI 5750 vs Geforce 9800 GTX

the 5750 offers slightly better graphic performance, is more power efficient and supports DX11. make sure you have a 350w+ PSU

Acutally the 5750 is quite a bit better, its even better then a 9800GTX+.

As ct1615 said, the 5750 is the way to go, as long as you have the PSU for it.

in terms of graphic performance? they would be the in the exact same ball park

the 9800GTX+ and GTS250 are basically the same card with a different name

The question between you to then becomes is 11% = "quite a bit better"

I would totally get the 5750. Even if you had the dell 305W PSU you'll be fine with the 5750.

I'm saying its quite a bit better then the 9800GTX (which the OP asked about), and just better than the 9800GTX+ (not by much), as you just proved.

Sorry if I wasn't clear.