I noticed in one of the articles I read that the performance increase was significant with some apps, almost non-existent with others. Wouldn't increasing the RAM or bus speed yield similar speed gains? I also don't see any cost benefit to RAID. Four 120GB drives will cost more than a single 500GB drive. You'd actually need at least five 120GB drives to backup 500GB worth of data (well, only 480, but who's counting?) with a RAID 4 or 5 array. Definitely think I'll stick with discrete drives and partitions for various purposes.