it's the 10000rpm and the partial SCSI implementation that does it...
The real perceived speed with the Raptors is the low access times. Seek and latency times are very low, and even lower on the latest generation of 72GB and 36GB Raptors.
Raid-0 Raptors will max out at anywhere from 80-120MB/sec on large file transfers, which is way better than anything else out there, but you will rarely notice that except on benchmarks.
The hot ticket right now is the chipset implemented SATA, such as the KT-600, which are pushing the 120-130 MB/sec transfer rates. But these differences are really only seen in benchmarks, not every-day use.
That said, I wouldn't give up my Raptor RAID for anything. You really notice it when multitasking. They can burn 2 different DVD's at 8x from the same partition and still do other tasks at the same time. Sweet..:bigsmile: