macOS High Sierra (10.13.6) 4k at 120hz is it possible?

[ch3m1c]

I bought an Acer Nitro XV273K monitor to test DisplayPort 1.4 4K 120Hz.

XV273K Pbmiipphzx - Tech Specs | Monitors | Acer Canada

27" - 16:9 - 4K UHD - Maximum Resolution 3840 x 2160 - Brightness 350 Nit - Native - Color Black

www.acer.com

In High Sierra, with GTX 1070, I can see 120 Hz refresh rate and 1000+ MHz max pixel clock frequency range in SwitchResX, but the display goes black when I try to select that option. The Nvidia driver doesn't want to set HBR3 mode. I think it's strange that I can see the resolution and max refresh rate but ch3m1c could not.

XV273K is interesting because it supports single cable DisplayPort 1.4 4K 120Hz 8bpc RGB and dual cable DisplayPort 1.4 4K 144Hz 10bpc RGB when you switch the display to 4K 144Hz mode (it changes the EDIDs of the two DisplayPorts, adding tiling info). Of course, macOS Nvidia drivers don't support dual cable displays (only the UP2715K - a patch was created to support that for the LG UltraFine 5K).

Wow, thats some true passion So we are pretty much stuck at 60hz or we can somehow patch the driver to unlock HBR3 mode?

 

[joevt]

Wow, thats some true passion So we are pretty much stuck at 60hz or we can somehow patch the driver to unlock HBR3 mode?

I think so. I'll keep looking.