I upgraded my video card to a AMD Radeon HD 7970 3 GB. I use two monitors, one a 42 inch and the other a 22 inch. I'm running opencore big sur on a Mac Pro 5.1 Needham. The video card keep running hot, fans loud and then it quits. I'm upgrading to AMD Radeon RX Vega 56 8GB HBM Graphics Card for Apple Mac Pro 2008-2012 580. Will I need to run opencore again to stay in Big Sur? I asked the guy who is selling it if it has a boot screen and he did not know what I was talking about. Can I just swap and the card and go?