Asus EAH5870 v2 Review
 

Once I started pushing the card I was able to slide up to 990MHz stable with temperatures around 65 degrees. Even with that, I would consider this card to be a good overclocker, but where the v2 is special, is with the voltage tweak ability. Once I pushed that into effect, I bumped the voltage on the core to 1.349v and was able to get the card up to 1035MHz on the GPU and 1275MHz on the DRAM. Yes, a 5870 just hit over 1GHz stable, and only around 70 degrees! I expect some pretty awesome performance jumps in the OCC Benchmarks.

http://www.overclockersclub.com/reviews/eah5870_v2/