Hmm, I tried flashing the Sapphire 512MB XT bios on my Sapphire Pro 512MB but for some reason the first time I rebooted after a long time Windows finally detected the card and somewhat installed the drivers properly, but it was still acting weird and there were a ton of artifacts on the screen so I decided to reboot, and after rebooting I could not boot anymore, it just kept rebooting over and over again.

Does the XT use enough power that if I was just on the edge with the Pro (500W Antec EarthWatts PSU) it might not have been strong enough to power the XT?

After the release of the 3870 I've been wanting to get one of those but since I just got the Pro a month ago I don't want to waste my money just yet. I don't know whether I can get a good portion of my money back by selling the 2900 Pro since there really is no point in getting it now that the 3800 series has the same performance but with half the TDP. I guess the only thing the 2900 has over the 3800s is the 512-bit RAM, the 3800s AFAIK have 256-bit interface.