Considering this card for my cMP 4,1 (5,1), but StarTech support can't confirm whether or not it will work in El Capitan. It's only officially supported up to Yosemite. Anybody using this card in El Capitan? Here's the broader goal: I'm looking for a USB 3 card that is reliable and supports booting in OS X without having to pay the price tag for this Sonnet card that I was originally looking at. It would also be a plus to not have to hook up internal power to the card, as is the case with the StarTech card. Suggestions?