XFX R7790 Black Edition OC 2 GB @ techPowerUp
 

XFX has completely revamped the HD 7790 reference design and optimized it for their requirements. The R7790 Black Edition OC 2 GB comes at reference design pricing of $150, yet is overclocked out of the box and provides twice the video memory. But can this extra memory make any difference?

http://www.techpowerup.com/reviews/X...ck_Edition_OC/