Hi all and thank you nice driver support. I make work and play games with my iMac 27", i9 9900k, Vega 48 and 40GB ram.
Installed fine and everything works like train's toilets. First DDU and reboot. Then I install Blue drivers with factory reset and restart. Then Red drivers without factory reset. Works great!
Was running for testing newest drivers from apple and made some quick tests with cs:go. I always using ThrottleStop to disable turbo-boost. Without it cannot play games at all because of heating and throttling. With MacBook Pro I used power settings to make max cpu 99% to disable turbo-boost.
So.. cs:go min/med quality and no browsers or anything else no-need-programs running at background. Windows 10 and games on USB 3 SSD.
Apple drivers:
5k: 98 fps 1080p: 409 fps
Blue 20.3.1:
5k: 111 fps 1080p 399
Red 20.3.1:
5k: 115 fps 1080p 399 415 fps
I wonder red drivers have more impact to more complex games. Didn't have time right now test more games.
i prefer using 2048x1152 resolution in games with 5k display, because 1920x1080 would be 2.66x smaller resolution than 2048x1152 what is 2.5x smaller. You can notise that on sharpness.