I know the 5,1 mac pro was not capable of having an additional thunderbolt 1/2 card. But with this new USB-C standard that has thunderbolt, displayport and USB 3.1 it makes things very confusing. I have a Inateck USB3 PCI-E card that works with normal hard drives and raid drives with normal UBS3 plugs. If someone drops by with a thunderbolt 3 raid array, will this work? Will this negotiate to the USB protocol? Can I use USB-C SSD's from Samsung on this? Any advice is appreciated! K.