TechwareLabs has published an analysis of RAID and Gaming Performance.
Today we take another look at Raid as it applies to gaming. Does using a Raid array benefit FPS, game loading, and level loading? We attempt to answer these questions and put them into the perspective of price vs performance under a single drive, two drive, and four drive scenarios. If you want blazing transfer rates and enhanced system performance then Raid may well be a good option for you.