Sapphire HD 7970 OC 3GB Dual-X @ RWLabs
 

The Radeon HD 7970 is AMD’s flagship graphics card, but this doesn’t mean there is no room for improvement. To see an example of this, one needs look no further than the Sapphire HD 7970 OC Dual-X graphics card, which is based on the Tahiti XT GPU, but instead of using the reference specs it comes with a massive Dual Extractor thermal solution, more robust power circuitry and higher clock frequencies to push the performance to the next level.

http://www.rwlabs.com/article.php?id=708