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r9 280x compatiblity

Joined
Nov 21, 2013
Messages
159
Motherboard
ASUS Rampage VI Extreme
CPU
i9-7980XE
Graphics
RX 580
Mac
MacBook Pro
Hi all,
I have an Asus Rampage IV Black, 4930k, and Sapphire r9 280x. I am having trouble booting booting into OSX if I connect my monitor via displayport. It boots fine if I connect via HDMI, but the resolution of my Dell U2711 is limited to 1080p on HDMI.

Further, video files don't work beyond a few seconds. Youtube videos tend to be constantly trying to reload beyond 1 second, and if played with say VLC or Quicktime, then they don't run just hang. Is this set of hardware not compatible?
 
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