So, I can't do this with my 2008 Mac Pro, but since you have a 2009 model, and you're STILL up to get this PCI SSD boot drive on your Mac or if anyone else is curious about doing this, here's a card that will enable you to install any SSD into the PCI slots and actually use the drive through the PCI port, rather than the card just being a platform to hold the SSD somewhere:
http://www.ebay.com.au/itm/SSD-Upgr...ltDomain_0&hash=item1e69255b9d#ht_3203wt_1297
Remember, this card only works with 2009 or later Mac Pros. (really wish I had a 2009 model right now).