OS first is correct. But if you are going to run RAID you often have to install the drivers for that. It would be on the Motherboard CD. You may need to put the driver on a floppy disc and when you start to install the OS it will ask you to press F6 to install any dedicated drivers. That is when you install them. Other wise the OS won't reconise your RAID setup

Diamond 3Dfx voodoo 2 16mb pci video card. Back when Unreal first came out. I remember that game was the CRYSIS of the day. I had to run it in a window to get it lag free. Had it in my Compac Micro tower with an AMD 266MHZ processer 128mb of ram and a 6GB hard drive.:P