MP 1,1-5,1 5,1 rx 5700 xt Win 11, Mojave, Monterey - Working. Ventura - Black Screen

[macrumorsnumpty]

Mac Pro 5,1
Radeon rx 5700 XT Anniversary Ed
OCLP 6.8 installed. (no tinkering with the standard OCLP 6.8)
x4 NVMEs
x2 SSDs
4k Dell Monitor connect via display port and have also tried HDMI.

Windows 11 works perfectly
Mojave Works Perfectly
Monterey Works Perfectly - Except periodically - Wifi fine, Bluetooth intermittent. AirDrop not working when bluetooth not loading.
Ventura shows boot screen, loads, but ends with Black screen. It has loaded and I can blindly (via the keyboard) log in, restart, shutdown. Back I just get a black screen.

Not possible to get 5,1 RX 5700 xt and 4k monitor working together?

Sorry for the stupid question, as I am.

 

[Macsonic]

Not a stupid question. : ) I read from another site that AMD 5700XT is not compatible with Ventura from this PAGE. But in this other site, the article says 5700XT works in Ventura. Not sure how accurate this is. https://bartechtv.com/graphics-cards-for-macos-ventura-in-a-hackintosh-or-mac-pro/