Hi Folks, I do have a 2010 Mac Pro with MacOS 10.13.4 running. Bootcamp is in place for a second hard drive and macOS harddrive has filevault. I bought a Sapphire Pulse Radeon RX 580 with 8GB but booting with this card just brings a black screen. No logon screen or anything else. It just brings two times the startup sound (about 10 seconds in between). Power is connect with one 6 pin to 8 pin cable. Do I need some drivers oder something else?