Asus Gtx 580
 

The 10MHz improvement in base clock speed does offer up a small boost in games. However, ASUS was not going to let that be the only point of difference with this card and included its Smart Doctor utility to get the most from the GTX 580. By utilizing this utility and tweaking the voltage, I was able to increase the clock speed from the base 782MHz on the GF 110 core by 23%, up to 962MHz. On the memory, the scaling was not as dramatic, but still went up by 14% to 1140MHz. This allowed the already fastest single GPU in the market to scale well beyond what the reference card was able to deliver.

http://www.overclockersclub.com/revi...gtx580_review/