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NVIDIA Geforce GTX 780 has no signal on DisplayPort on Mojave

Joined
Apr 8, 2020
Messages
1
Motherboard
Apple
CPU
3,2 GHz Quad-Core Intel Xeon
Graphics
EVGA NVIDIA Geforce GTX 780 3GB
Mac
Mac Pro
Hi all,

First of all, I'd like to ask for help with my "nonhackintosh", but real Mac. Cannot find any help elsewhere, so I hope you "hacking guys" may help.
I bought a new EVGA NVIDIA Geforce GTX 780 GPU and plugged into my mid 2012 Mac Pro a few days ago. Went through all those upgrades from El Capitan to Mojave. But I can get the signal on HDMI port only which offers me 3840 x 2160, 1920 x 1080, 1080p and 1080i resolution. Any of those resolutions seems to me a bit uncomfortable to use on my LG 27UD68-W 4K LCD 27" screen. So I'd like to get the signal from the DisplayPort because it will give me more resolution variation that I can choose from, I suppose (the best option is 2560x1440 for me). But there's no signal on DisplayPort when I boot up. I wonder why because on High Sierra there was no problem.

I have no Cuda installed now. I run Mojave 10.14.6 (18G4032). I know there are no NVIDIA drivers available for Mojave atm.

Thank you for any help, tips or hints.
 
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