Summary: First, this card is very well designed, quiet and cool. I used it to replace dual 6950's in crossfire because I didn't want to deal with all the driver related issues SLI/Crossfire have. I'm very pleased with the default performance, but a bit disappointed that you cannot overclock this card.
Summary: After reading about how well these Ghz versions of the 7970 overclock, I took the plunge. I spent hour, trying everything from simple .cfg changes in Aftreburner, to registry edits, until I eventually discovered that Gigabyte have totally locked down any voltage changes.