I'm interested in this too. I have a XP2100 in a Gigabyte GA-7VRXp, which is supposed to support the XP2600 (since it has the latest bios flash). My chipset is also KT333, so if it supports the XP2800, I'll wait for that chip. I'm not in THAT much of a hurry for a few more frame rates.
Does anyone know if we can use the xp2800?
The fact that no one understands you doesn't mean you're an artist.