Sapphire HD6950 2GB DiRT3 Edition
 

I was able to get my card to overclock pretty well, seeing a 12.5% increase on the GPU Core and 12% on the memory — 900MHz and 1400MHz, respectively. While the GPU Core clock speed was about just below the average, it is still a nice bump; however, the memory was the third highest clock in the running. The only complaint that I do have is that the card is quite long, but this is becoming more of a norm in the market with high-end graphics cards to accommodate the cooling that they require.

http://www.overclockersclub.com/revi...pphire_hd6950/