the reason the Scsi will work is becuase it gives each device its own interface, so where as on a standard bus u will see each device using the same limited thruput on your bus, the scsi devices are independant of oneanother, and thus can communicate on a 1 to 1 basis, as apposed to using the same bus, going thru the motherboard. ... The ultrawide scsi is very good, altho u r looking at alot of money, try looking at the seagate cheeta, i think its around 15,000 rpm .... also u should look at the transfer rate and latency, as the rpm of rotional media is only 1 element of the equation.