Which one is better? I checked online for theoritical benchmarks which states that the 9800 gtx+ is better but does anyone have real benchmarks of their performance?
Well, I can say that the 7770 is the better GPU. My breif search didn't put up anything directly, but i have a senthetic benchmark:
http://videocardbenchmark.net/gpu.php?gpu=Radeon+HD+7770&id=322
http://videocardbenchmark.net/gpu.php?gpu=GeForce+9800+GTX%2B&id=92
And you can gauge the two card's relative gaming performance with Tom's Hardware GPU heirarchy chart which shows the 7770 two tiers higher:
http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107-7.html
9800gtx = 440gt, 630gt. 7770 is a much better card. a fair price for 9800gtx would be around $30.
the 9800GTX+ isn't better at anything than the 7770
http://www.anandtech.com/bench/Product/612?vs=536
640=a faster, cooler, quieter, more energy effecient version of the 9800CTX+
also its not a DX11 chip