Assembled a rig with an off brand X99 board, I7 and an RX580

Trying to play games will cause intermittent black screens and flashing.
Driver is most recent and it all runs off a 500W 80+ Bronze unit.

Recommend wattage is 500 so I'm at the minimum.

Get SPECCY here: http://www.piriform.com/speccy/download
...get the FREE version from either link listed.
...Speccy is a really nice system hardware/temperature, information Utility.
...simply install it...and run the program...then post a screen shot of the main page of the program, when posting a problem/question on these forums.