I have pair of WD Raptors on RAID0, so does Kate B. There is without doubt a clear increase in speed, I did run with just one before buying a second. The RAID controller you use will also affect performance, that included with the nVidia nForce 4 chipset is a good one. Before setting up for the first time I sent a query to WD support about the stripe size to use, they recommended 128KB for a home PC and that is what I use.
This thread is now locked and can not be replied to.