Fast fast fast fast fast fast.
Did I mention it was fast? Wheee!
Eventually I will bother to install XP and fuck about with the drivers there, but in the meantime this thing is really fast. It's damned fast!
(By the way, is there a way to install XP without installing its stupid bootloader into the MBR? I don't want to reattach the SCSI disk that used to serve as my WinXP system because that requires fiddling with the finicky RAID controller I carried over from the other machine -- I'd much rather install XP onto the data partition I have already)