Ok, dont bother with the old SCSI, Get at least Ultra 160 and the new fluid dynamic bearings on the 15k SCSI U160 and U320 are very quiet. A good Adaptec controller can be had for about 100 bucks for a U160, and 160 bucks for a U320 on ebay. If you are going to use SCSI, a raid setup is far faster too, but SCSI raid controllers are priced very high. Even a used one is going to cost you a few hundred. It is far far superior to the sata and ide controller on the mb, and no, they have nothing to do with each other. Try to purchase a 68 pin drive and buy the best cable you can, it is very important to have a U160 or U320 cable when you are running those drives. The old Ultra 2 is about as fast as the fastest sata drive, and if you go with a U320, running at 15K rpm's, it is smoking fast. they are about 2.9 ms with outstanding internal and external transfer. Big bucks though. If you dont have the money, just use the sata raid, it is ok, and about 25% of the cost.