Using AMD GPU Clock Tool For HD 5870 Overclocking
 

With the launch of the AMD Radeon HD 5870 graphics card fresh on our minds, we couldn't help but wonder how far we could overclock the card if we weren't limited by what Catalyst Control Center capped us at? With stock speeds of 850MHz GPU and 1200MHz Memory, there may be a bit of extra headroom to overclock this beast!

Armed with RivaTuner, we were let down...the latest version that we could find did not support the 5870. With no support in either RivaTuner or ATI Tool, we decided to talk to the man who has already pushed the card to the extreme, Sami Makkinen.

http://www.legitreviews.com/article/1090/1/