I have a late 2013 Mac Pro and a Samsung UE510 UHD 4K monitor.
I am connecting these two through a HDMI-2.0 cable.
However, I am only getting 2560 x 1440 @ 30Hz.
How am I able to get to 60Hz?
I talked to a support representative however she doesn't seem to have the knowledge. so posting here.
Mac Pro (Late 2013), macOS High Sierra (10.13.6)
[mini] DisplayPort cable plugs right into ThunderBolt-1 or 2, picks up the correct signals, and works. It also drops the Legacy "heartbeat" refresh required for CRTs, and just sends the changes. DisplayPort displays have an internal screen buffer, so refresh is great, no flickering.
The built-in HDMI port on the Mac Pro 2013 is only a HDMI 1.4a capable port and as such can only do 4K at 30Hz.
If you had a Displayport monitor it can do 4K at 60Hz and it is also possible to get a Displayport to HDMI 2.0 adapter which can also do 4K at 60Hz.
See - https://www.club-3d.com/en/detail/2339/mini_displayport_1.2_to_hdmi_2.0_active_a dapter/
Note: It needs to be an active adapter not one of the cheap passive adapters.
Don't think you are going to get it using HDMI 1.4 You should use Display port connection.
How to render 4K at 60hz with 2013 model Mac Pro?
