XFX plans overclocked Radeon HD 5870 Black Edition
 

Industry sources have confirmed that XFX plans to start overclocking Radeon HD 5870. The new product should come to market in November and that it should be nicely overclocked. Our sources claim that XFX still has to make up its mind about the final overclock, but it should not be just a marginal increase, although we must point out that we don’t have any numbers for you yet.

http://www.fudzilla.com/content/view/16279/34/