- Apr 5, 2016
- GIGABYTE Z170X-Gaming 7
- GTX TITAN X
- Classic Mac
- Mobile Phone
Maybe they used the Dell UP2715K EDID to make it work with Nvidia in macOS but the display is not enough like the Dell UP2715K to work properly? Or you may need to power off the display and power it on to make it switch to dual cable mode?Thanks for the reply. Strangely, that this exactly what MacOS and Windows reports my display to be. The makers of the driver board either nicked the Dell firmware or they make one of the boards inside that monitor.
After more trying I couldn't get a dual DP 5k signal in either Windows or MacOS with my GTX1080. So I installed a 5700XT crossing my fingers that this would work.
It works perfectly in Windows and MacOS. Dual cable 5k60Hz. 10 bit colour in Windows, and I guess similar in Mac though I don't know where to check that.
In the BIOS screen and the Opencore GUI it uses 1440p and then switches to 5k when loading either OS. No glitches or problems waking from sleep, switching OSes etc.
Image quality is amazing and thoroughly glad that German chap made his YouTube video which gave me the inspiration.
To see the pixel format of the output signal, look at the output of the AGDCDiagnose command. The macOS gui only shows the frame buffer pixel format which may be different. The AGDCDiagnose output also shows the EDIDs of both cable connections (SwitchResX only shows one EDID and it might be modified by macOS).
BIOS probably isn't smart enough to handle dual cable displays, so it uses the single cable mode of 1440p or 4K.