Hey, So, I have a GTX 1070 running in my Mac Pro right now. But, I also have an RX 460 on the side. Is there anyway I can use either of these cards on the cMP with a boot menu, so I can run MacOS on an external drive? I tried pressing enter and a bunch of keys on a blank screen since I don't have a boot menu and couldn't boot my cMP to either my internal or external drive. UPDATE: I realized that I didn't have Nvidia web driver loaded into the external MacOS drive. Oops! I will try again and will update.