- Oct 17, 2013
- Gigabyte Z390 Designare
- RX 580
- Mobile Phone
Unfortunately that's not correct. If you search this thread for posts by "joevt" you will find a number of detailed technical posts regarding this issue. The bottom line is that we cannot trust the resolution information provided by macOS in some places. For a true 5K monitor (5120 x 2880) driven by a single DP-In, the actual frame buffer resolution is 4096 x 2304 (9.4M pixels). This is more than 1 million more pixels than a 4K monitor, but still a little less than true 5K.
The 34" LG monitor that you are considering (5120 x 2160) is 11M pixels, which is more than the 9.4M pixels that a full 5K monitor receives from this motherboard. That is why I don't think this system will provide full 5120 x 2160 resolution through the Thunderbolt port.
However, if you buy a Gigabyte GC-Alpine Ridgle (not GC-Titan Ridge) then you will be able to drive this monitor at its full resolution via Thunderbolt 3. The nice thing about the GC-Alpine Ridge is that:
The reason to stay away from the newer GC-Titan Ridge is because:
- Even though it needs a Thunderbolt Header connection to the motherboard (THB_C) -- and the Designare Z390 does NOT have this header -- we don't have to worry about it!
- Just connect 2 DisplayPort cables from the AMD Graphics Card to the 2 DP-In ports and you should be good to go.
- However, we should not expect any other Thunderbolt devices to work because the THB_C header is missing. Only Thunderbolt 3 monitors can be expected to work.
- The Titan Ridge controller on the card is the same as the Titan Ridge controller on the motherboard.
- The motherboard will disable the built-in Titan Ridge controller because it sees a duplicate device. The Gigabyte firmware should be smart enough to support both controllers, but I don't think it does.
- So the on-board Thunderbolt ports may not work.
Thanks for the time and effort you put for once again Casey!!
So as far as I can understand, I can run 34WK95U (5k2k) at 4k res (only horizontal 4k, vertical as I have found shall be around 1600) without issues at 60hz right? I think I can try that and see if Im happy with the results. If not, then I can buy a Gigabyte Titan Ridge tb3 controller and plug 2 DisplayPort cables from my rx580 to mini dp ports of the controller. Then I connect a tb3 cable from controller's tb3 connection to the the monitor's tb3 port. I lose of course designare's tb3 ports but Im staying with an additional tb3 port from controller to plug in my Lacie 2Big DAS system. Is it sure that all these are going to work without any issues and out of the box?