The most important thing has not been addressed yet!
The HBA itself. Those DPT HBA's were very slow in RAID0. Like the Adaptec 2100, RAID0 should be called JBOD with stripes.
Those old SCSI disks will be hot, noisy, and slow on a desktop. That HBA is ultra2 not ultra 160. Either way the peak STR will not come close to approaching 80MB/S let alone 160 if that were possible.
A fast HBA makes all the difference in the world but you (generally) do get what you pay for...