8 MB cache or 16? IDE or SATA, vanilla or 2 x 120 in RAID 0? What motherboard make and model? What AMD CPU? 64 bit? Which 64 bit AMD CPU? These things make a big difference to the PC's performance. If you're planning on a performance machine you really need to take the time to familiarise yourself with the nitty gritty or some salesman will take you for a ride.