New computers with an Intel Chipset like this one support RAID and AHCI. Unfortunately you can't install Windows XP without the use of the F6 + driver disk method of loading drivers for installation, but only using a floppy. What happens when you don't have a floppy drive? You have to jump through hoops.
Unfortunately, if you don't happen to have another computer with a floppy drive both Intel and Asus make things even more difficult. The Asus install CD has a make disk utility to create the driver disk, but requires a floppy drive in order to get at the drivers. Intel does not make things much better. They also provide a disk creation utility. It happens that they use WinImage, which at least means you can extract the drivers, but it is unfortunate that they don't just provide a zip disk.
Once I figured out that I HAD to use the drivers from the disk image, things went smoothly.
For those of you shocked that I actually installed Windows XP, the computer is in fact for me and XP is necessary for the work I will be doing with Kate starting in January when my paternity leave ends.