I just bought a Razer Core X ogpu for my MacBook pro (Mojave: 10.14 beta). I installed a XFX Radeon RX 580 GTS XXX and plugged it in. Everything works great at lower resolutions @ 60hz nut if I try playing a game at 4k 60hz the screen will turn black off and on. There is also a popping noise (I think from speakers) when it goes black.
I am brand new to this. I don't see where there should be any drivers to install on the mac. Any ideas? I don't even know if this is a good place to ask.