I just set up the Addonics Quad mSATA PCIe SSD card with 4 Samsung 840 EVO mSATA SSDs. It works great and is bootable. http://www.addonics.com/products/ad4mspx2.php http://www.amazon.com/Samsung-Elect...E500BW/dp/B00HWHVOQS/ref=sr_1_2?s=electronics By default it works in Yosemite as 4 JBODs. you have to run Windows/Bootcamp to use the utility to set the Addonics card to work as a RAID0 drive, at which point it works just like the OWC Accelsior, like a single drive in OS X. *****NOTE, the OWC Accelsior shows up in the marvel windows RAID config tool. Like an idiot, I thought the OWC Accelsior drive I had was some errant virtual drive and nuked it. Thank goodness for Time machine. So if you have an OWC drive, when you set this drive don't make the same idiot mistake. Anyway, my 1TB OWC Accelsior drive writes at around 300MB/sec reads at about 600MB/sec via the black magic app. The Addonics does about 650+MB/sec on both read/writes. I almost got the OWC 2TB, which is supposed to do about 726MB/sec: https://eshop.macsales.com/preorder/OWC-Aura-SSD-for-Mac-Pro/ I'm glad I went with the addonics, it cost about $300 more than the 2TB OWC drive, but I'm getting double the space! So the down side is that it doesn't seem to report SMART status nor does it support TRIM. Some have said it should (see here http://forums.macrumors.com/showpost.php?p=20634760&postcount=7 and here http://forums.macrumors.com/showpost.php?p=20635417&postcount=8), but when you check the radio button to turn SMART on the card, it just deselects in windows. So not sure if I'm doing something wrong, or that it just won't work with a RAID'd device. Anyway, hoping that the garbage collection is good enough to keep the drive working well enough. The OWC drive was fine with just garbage collection, so we shall see. Hope that info helps anyone looking for more bootable SSD storage. I have a couple of questions for anyone that might know: (1) Has anyone has found a better mSATA card? I think this card only uses 2 PCI lanes so its throughput is limited to 10GB/sec, and I think with 4 drives in there, you could do better with a true 4 lane card? (2) Also, does anyone know of an mSATA card that has 8 slots? Would be great to have an 8TB SATA drive.