XFX has a lifetime warrenty litterly. you can also change the stock cooler and not void warrenty also you can over clock and if it goes out not void warrenty. i have had a few of there cards burn out on me and i can say 2 week you send it back you get a new one.
I was considering this GPU but after reading a little about constant WoW lockups thinking a little less about it and maybe down to a 5870. But in case I don't, why the huge price difference between XFX and Sapphire for the same GPU? Is there a reason I don't know about?