I'm having a bit of a hard time with my 5970, but didn't realise until this weekend just gone. My colleague and I both built our systems around the same time and have almost identical components except for motherboard, RAM and PSU. He's getting a WEI (yes.. I know it's only a reference and not a true reflection of overall performance) of 7.7 for both elements of graphics performance, whereas I only get 7.4 with the same card and Catalyst driver version. It shows in framerates on games too. Admittedly, there's not much in it, but I can't help feeling I've got a 'duffer' if you know what I mean? Both cards in question are XFX Black Editions and both are at stock speeds. Our CPUs are clocked. His to 4.00GHz with 12GB RAM, mine at 4.4GHz with 6GB RAM. We've both got 1kW PSUs albeit different brands, though both reputable and both running the same version of Win7 x64. Could somebody please help me fault find or give me a list of checks to run through? I don't get any glitches or artefacts with my card, and neither does my colleague, so one can assume both cards are 'healthy'. I'm completely baffled!