Remember, that a RAID 0 is intended for providing maximal data transfer speed and should be regularly back-up (everyday) to avoid loosing data in case on the disk fails.
Hereafter are the read/write performances of the original reference SATA HD 160GB (to avoid the HD cache effect the test was conducted with series of large test files):
Software RAID 0 with 2x 150GB Raptor:
The difference is huge and impressive, the overall behavior of the computer, original very reactive, is even improved; during the booting procedure, once the RAM test is completed the finder is almost immediately accessible.
But there is a side effect... the noise. The WD 150GB Raptor is already a relatively noisy HD, with such setting in RAID 0 the Mac Pro, originally a silent computer, becomes a HD scratching machine, sounding a bit like some cheap PCs... quite annoying with time.
