I have a 2009 Mac Pro with PCIE card with two SSDs in Raid0 as the OSX boot drive (El Capitan). Since OSX can't install bootcamp on an "external" drive, I wanted to see if I can just move my Windows 10 SSD over from my PC and install in the MP and run with it. So I installed rEFInd bootloader and then installed my windows SSD (after running sysprep on it while in the PC) to remove drivers etc. What the heck...it might work, right ?? So ...almost....but not quite. I booted the MP and selected the windows SSD from rEFInd boot options options .... and it did start to boot windows, and in fact it looked like I was just about to get my windows login screen...... then BOOM ...reboot. So, I am I SOL on this setup? Or, is there a way to actually get my Windows SSD to boot?