Well, before…
…
and afterwards…
… so, much to my surprise, this one worked pretty quickly, install drivers, reboot, update BIOS, reboot, done.
For a first test, i decided to use PrjCars2:
Turned everything on/max settings, used my benchmark test track (COTA, 32 cars, 2200, lightning storm with rain…) and - coil whining 
Didn’t have time to play around with FPS limit or the C… something adaptive framerate tech that VEGA cards seem to have, but with fixed 60fps (come to think of it, there was a setting in PrjCars2 that said 1920x1080, 59fps…) i had some nice, audible feedback that the GPU is working well…
ah well, let’s see tomorrow when i can try some other game(s).