If you enable the Raid Controller, it boots a little slower because it has to detect those two additional IDE connectors. (no biggie though)
I just use mine as additional IDE so I don't have to share ribbons. (I'm probably superstitious, but seem to have great luck this way)
IDE 1 => CDROM
IDE 2 => CDRW
IDE 3 => UDMA 100 HD #1
IDE 4 => UDMA 100 HD #2
(I don't use raid)
I'll add my $.02 and say the KG7 has been terriffic here too!
Easy install, good manual (used it like a cookbook) and rock-solid stable on XP (I love that the XP natives take care of ALL the MoBo drivers with no additional installs. [ie: you don't install 4 in 1, you dont install AGP miniport driver, you don't install HPT370 drivers.... XP's got'em all right]
but even when I was on win98 (se), the board worked great with latest bios and drivers