This is for you and anyone else looking to install SSD drives in a Mac Pro.
I got tired of all the research I had to do to be able to mount SSD drives cleanly in my Mac Pro without sacrificing the other 3.5 sled drives or anything else. I wanted bootable and I wanted fast.
These two options are bootable and very fast and don't sacrifice anything. They can't be beat (Other than price) but if you are looking at SSD drives then price isn't the issue. Installing and speed are!
First is the DX4 from Trans Intl - it gives you 4 hard drive locations for 2.5 SSD drives. Comes with the SATA cables and a special power cable for powering all four drives plus instructions on connecting them.
You will still need either a SATA card or if you have the 2008 mac pro, use the two SATA ports that are on the motherboard that are also bootable and are each separate SATA II ports. It is pricey but very cool.
I am using this with two SSD 40gb OWC drives in a RAID 0 for my boot drive and apps. I average between 400-500 MB/s! My boot time is less than 15 secs, I love it!
Second is the Velocity Solo from Apricorn. I used to use Apricorn stuff on my old Apple II systems, they are a great company.
I ordered this tonight, but it is a SATA III PCI-e 2.0 slot card with a mount for an SSD drive on the card and an extra connection for data to another SSD drive. They told me it will work with PCI-e 1.1 but there is a speed hit obviously. It was only $49.00 without shipping and obviously without the SSD drive. BUT it is SATA III. They also told me they have a Velocity Solo 2 in the works. Only thing I didn't like is they max out on this at 400MB/s but for $49.00 it's not bad.
I'll know more about this in a week when I get it.
Regarding getting an SSD drive for them. I recommend having TRIM support and overprovisioning. Plus a long warranty. I personally went with OWC because they are a great company. OCZ appears to make good drives also and I've heard some good things about Intel SSD drives, but don't quote me.