If you want a quick glance over performance top down for graphic cards, reference this chart.
http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107-7.html
Intel core i7 930 OC @ 4.0 ghz
XFX Double dissipation Radeon HD 7950 356 bit 3gb GDDR5 OC @ 1150 MHz core + 1575 x 4 memory
Triple channel DDR 3 12gb RAM 1600 MHz








