following up on that:
I brake-tested the GPU a bit by now, and had two instances where the picture went black, but could not reproduce it. So i installed the newest (bleeding edge omfg Xtreme G4mer Edition) drivers and used my PS4-setting for bench’ing purposes:
I saw the card drawing 249W for a moment, but was too slow to catch it.
What else... Yeah, i ___am___ glad i went for the 650W PSU now, because if the CPU will decide to stop idling around for some reason...
Ah, also decided to open the lid when checking the temps, since it was getting quite cozy in there…