XFX RADEON HD 7950 BLACK EDITION OC

With the launch of the 7950 now here, how have XFX managed to tweek the reference design in the Black Edition Overclocked to push towards 7970 territory?

http://www.eteknix.com/reviews/graphics/xfx-radeon-hd-7950-black-edition-overclocked-3gb-graphics-card-review/