XFX HD 7970 Black Edition
 

The crew at Overclockers Club has just put the finishing touches on their review of the XFX HD 7970 Black Edition video card. For comparison purposes, you can see our evaluation here. Keep in mind, the base clock speeds of 1000 MHz on the core and 1425 MHz on the memory are already sizable increases over the default clock speeds. However, XFX has added their Double Dissipation cooling to increase the overclocking potential of their Black Edition HD 7970. As a result, the card responded well to voltage tweaking and a further boost in the clock speeds to 1177 MHz on the Tahiti core and 1652 MHz on the GDDR5 memory.

http://www.hardocp.com/news/2012/01/...black_edition/