"As we mentioned in our introduction, XFX have chosen to stick with AMD's reference cooling solution for their Radeon HD 5850 Black Edition, which means that all of the exciting stuff is going on under the hood with this particular card. This good stuff comes in the form of a 765MHz core clock (a 40MHz boost over reference speeds) set against an even more impressive 1125MHz memory clock, a 125MHz boost over a standard Radeon HD 5850."
http://www.elitebastards.com/index.php?option=com_content&view=article&id=1059&catid=13&Itemid=27
