That's what was in my system that I had to pay to send back to sapphire after it kept freezing up whenever it had to work (WOW / 3DMark05). I NEVER got in further than 30s in WOW nor past the green light through the forest in 3DMark05. It runs quickly when it works (37-42fps for the shootout segment at the start of 3Dmark05) but does not finish the job and does not allow playing games. Sapphire's tech was not too helpful and I have to pay the shipping to get the card fixed (& bought an nVidia card as I would not go 1 month without my comp waiting for Sapphire (and I could not ethically sell it to an unsuspecting sucker on eBay knowing that it is problematic). So what I'm saying is if you get it, make sure you have a backup PCI-E card.
True, it's not a night and day difference, but it is a bit faster in most games. Definitely enough to justify buying it at $130. The thing I like about the card is that it has a 256-bit bus. If it can be overclocked a little it should easily beat the 7600GT.