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https://www.samsung.com/us/computing/monitors/uhd-and-wqhd/32-uj590-uhd-monitor-lu32j590uqnxza/#specs

Says 60hz on the site, tried HDMI1, HDMI2, FreeSync, tried various HDMI cables, even bought an HDMI to Thunderbolt cable to try instead of HDMI out of the mac.

What gives?

My old mac mini can drive my 60" TV properly, but my Mac pro can't drive an UHD display? Seems like I should be able to do this....

This is the only resolution I can get 60hz at:

displays

EDIT Answer marked below. For anyone wondering:

thunderbolt

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In order to drive a 4k display at 60 Hz over HDMI, you'll need a GPU supporting HDMI 2.0. The 2013 Mac Pro supports HDMI 1.4 by default.

To get this working, you'll want to use a cable plugged into the DisplayPort connector on the monitor, and into the Thunderbolt 2 ports on the Mac Pro.

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