The card that XFX sent in for review was clocked higher than the reference board we looked at ­ the GPU is clocked at 450MHz and the memory at 1100MHz, which is about as fast as you're likely to find any 6800 Ultra card. Trying to push the GPU a mere 10MHz further made it fall over in the benchmarks; although it was still possible to push the memory a bit further than its default speed. To verify the speed of the XFX 6800 Ultra I contacted XFX and the reply was that all cards will be clocked at a minimum of 425MHz, but the 450MHz core speed can't be guaranteed. It’s therefore worth checking before you buy.