I’ve added some performance notes to my review of the OWC Mercury Extreme solid state drive (SSD).
I had hoped that a 4-drive RAID 0 stripe using the lower optical bay and three of the regular bays would work around the Mac Pro’s bandwidth limitations, but alas, no gains were to be had.
Want your own SSD-based Mac Pro? Call me for consulting. Better yet, OWC will build and rigorously “burn in” your new Mac Pro, then ship it to you ready to use (doesn’t have to use SSD, any configuration possible).