09-18-2017 08:15 PM
I've tried using my Z27s 4K monitor on my Z620 with three different graphics cards (nVidia GTX 680, nVidia GTX 980 Ti, and Radeon 6870) under Windows 7 Pro and Windows 10 Pro as well as with a Mac Pro and several versions of OS X (same graphics cards) but I have not been able to get a 60 Hz refresh rate at full 4K resolution.
I haven't been able to try all connection combinations on all cards since they don't all have the same ports (or some ports weren't functional on the Mac Pro).
Right now I have the display connected to the Z620 with the GTX 980 Ti using a DVI to HDMI cable. Its running 4K at 30 Hz which I believe is the maximum possible with that cable.
But I should be able to get to 60 Hz with a Displayport cable. I've tried that (I think the cable I used came with the monitor) but I can't get above 30 Hz at 4K. Before I go buying another Displayport cable, is there any other reason that could be preventing me from getting to 60 Hz?
I don't want to find out that this monitor doesn't support that!
09-18-2017 08:49 PM - edited 09-18-2017 08:54 PM
Did you install the latest driver? Device manager should indicate your Display model and driver level.
The NVIDIA GTX 980 T1 is more than capable of going past 60 HZ. I am running 144 hz using a native displayport cable. However, my resolution is only 2560 by 1440.
Look under Display Adapter Properties ----> List All Modes --> do you see a vaild 4K mode @ 60 Hz? Is it set?
Only cable up one device to the monitor and if multiple were connected then power cycle the monitor when it's connected only to the PC.
Most monitors have a menu to look over the resolution and refresh rate. Check the set refresh rate.
HP Envy 17", i7-8550u,16GB, 512GB NVMe, 4K screen, Windows 10 x64
Custom PC - Z390, i7-9700K, 32GB, dual 512 GB NVMe, dual 512 SSDs, 2K screen, OC'd to 5 Ghz, NVIDIA 2080TI 11GB
02-23-2018 05:36 AM
Of course you can't past 60 Hz at 4K with that monitor since the monitor supports 60 Hz at 4K. Have you checked it's specifications before?
There you go: