Inateck KT4004 Controller Cards USB 3.0 4 PCI Express slots Mac Pro Auto Supply (Accessory)
Works with Mac Pro (Mid 2012 - MacPro 5.1, Yosemite), but not on a Mac Pro 2.1, OS X does not have the drivers. For older Mac Pro, it would therefore suffice to update via EFI to an 64 to turn Yosemite, Maverick, ...