I have got an early 2008 Mac Pro running Yosemite. Now my Belkin F5U252 USB 2.0 PCI Express Card isn't working. Could this be a driver issue and where could I get drivers for the card? I am also thinking of getting a USB 3.0 card for the Mac Pro. Is the Sonnet Technologies USB3-4PM-E Allegro PCI-e Card any good?