GPU: XFX Vega 64 Air
CPU: i5 4690k @ 4.5Ghz
Motherboard: Gigabyte Z97 Gaming 3
PSU: EVGA Supernova B2 750W
RAM: 16GB Kingston 1600 DDR3
I get crashes unless I set a -20% power limit. The screen freezes for a few seconds, goes black for a few more until the driver recovers. temps hit 75c on at any voltage stock fan profile but my ambient temps are pretty high (I'm Australian), and the card has ample airflow. setting a custom fan profile will make to card top out at about 63c, still crashing.
I have noticed some weird readings from GPU-Z, namely a spike in power usage up to a ridiculous 1800w, but I this happens even with my power setting at -20. At stock settings I may even get crashes on the desktop, they are rarer but they do occur.
really hope I don't need a better PSU to run this, it's been an excellent PSU for the few years I've had it, and handled my power hungry R9 290 just fine.