http://www.hexus.net/content/item.php?item=3621XFX have taken the 6800's GPU from 300MHz all the way up to 325MHz - not exactly a stellar boost. GeForce 6 series GPUs do tend to overclock at least a little, so this 25MHz bump in core for the XT is a pretty safe bet for the company. If pricing is competitive towards slower clocked 6800 variants then it could grab a pretty good share of the mid-range gaming graphics market.