been trying to install the latest Crimson drivers (16.5.2) but no luck. Screens goes blank during installation and never comes back. Rebooting leads to a black screen. Have to reboot again for Windows to sense there's a problem and I can then boot into safe mode and DDU the shizzle.
Tried again after that but same result unfortunately.
Asus X99-Deluxe (loaded optimised defaults to rule out overclocking instability) 5960X 2x R9 280X DirectCU2 TOP (DC2T-3GD5) in Crossfire Windows 10, 64bit Dell U3415W monitor on mDP