Brief:
PowerColor’s new HD 6950 Vortex II comes with a seriously improved thermal solution compared to the AMD reference design. It also offers two adjustable fans that can be configured to make maximum use of available space. Clock speeds have been increased too, and the card was able to be modded to a HD 6970 in our testing.
Link:
http://www.techpowerup.com/reviews/Powercolor/HD_6950_Vortex_II