Apple introduced a new built-to-order option for the Mac Pro... a PCI RAID card.
The Mac Pro RAID card offers improved performance and data protection to your Mac Pro system -- up to 304MB/s of sequential read performance in RAID 0. Ideal for video and creative professionals with demanding storage needs as well as for tower server applications, this hardware RAID option supports RAID levels 0, 1, 5, 0+1, and Enhanced JBOD. It has 256MB of cache and an integrated 72-hour battery for protecting the RAID cache. The card occupies the top PCI Express slot (slot 4) and connects to the four internal drive bays.
The build to order option adds $999 to the price of your Mac Pro and does not appear to be available separately at this time. It also listed as supporting Mac OS X only, so will not work with Windows/Bootcamp.
