6G SATA Bootable (with Boot Camp too) with 2 SSD Mounts on one card - NOT Sonnet Tempo Pro or Apricorn X2 I've gone through an Apricorn X1 (Slowish, and crashed my system) and a RocketRAID 642L in my quest to have my 2009->2010 Mac Pro bootable via 6G SATA. The RocketRAID slowed down POST by nearly a minute in Windows (Boot Camp) and my usual two-spins of the load icon in OS X were increased to 12. That, and you need to flash an EFI64 firmware onto it prior to being able to boot it into OS X, so it needs to be installed in Boot Camp or in a PC first. Lame. The Apricorn X1 would cause system hangs. I found the Syba SD-PEX40068 on Amazon, which uses the 88SE9230 chip, which is superior to the 88SE9235 on the RocketRAID in that it's a HW RAID controller. I was pleasantly surprised to find the following: 1) My system now boots to my Samsung Extreme SSD in less than one spin of the load icon. And without requiring a driver. Also boots Windows without requiring a driver. 2) With my Boot Camp SSD mounted in the second slot, I could choose to boot to OS X from Windows using the Boot Camp utility, and from OS X to Windows using the Select Startup Disk 3) My Windows time only increased by about 3 seconds, with the POST info from the Syba taking a small fraction of the time the RocketRAID did 4) Sleep works. It takes the controller a little longer to wake up (~10 seconds) but it comes back and works fine. In both OS X and Windows. 5) There are 2 internal SATA ports that I've run to my 5.25" bay so I can mount another couple SSDs if I feel the need. 6) It's only $43.60 as of writing this! - http://www.amazon.com/gp/product/B00BG0NMNA/ 7) Windows HDD score on my 3G SATA Intel SSD improved from 7.3 to 7.6, and it's only a 3G SSD. I don't see a Sonnet Tempo Pro performing any better...this is really a steal for what it lets Mac Pro guys do on the cheap. Here's my system specs and a benchmark: 2009->2010 Mac Pro Xeon W3690 3.46GHz 6-core 24GB Corsair CL-9 ECC Registered GeForce GTX 680GTX 2GB Orico USB 3.0 Adapter (working with Generic USBXCI Driver) - http://www.amazon.com/gp/product/B008V3TH48/ 240GB Sandisk Extreme SSD 80GB Intel SSD Both SSDs in a Syba SD-PEX40068 (linked above) 2x WD Red 2TB HDDs in internal bays EDIT: Here's 2 Samsung 840 Pros in the Syba SD-PEX40068 vs a 480GB Accelsior E2 in QuickBench.