Q: 3 4k monitors on mac pro not working
I have 3
Samsung - UD590 Series 28" LED 4K
monitors and i have 2 connected via the mini display port to HDMI and one connected via the HDMI port, apple says this configuration should work but i can't get the 3rd screen to ever fire up, i have tested all three screens and only two of them seem to work at any given time, Use multiple displays with your Mac Pro (Late 2013) - Apple Support, any help would be much appreciated! Thanks!
Mac Pro
Posted on Sep 22, 2015 5:38 PM
i have 2 connected via the mini display port to HDMI
Those are considered "Legacy" adapters, as is the built-in HDMI port, if you choose to use it. AS the article says, you are limited to TWO legacy displays, not 3.
If you were to use Mini DisplayPort to DisplayPort cables for at least one display, all would work.
Posted on Sep 22, 2015 6:11 PM