HD 7950 Port Mapping Question

[Gazember]

My 5,1 MP has been working great. The 7950 has done an excellent job in FCPX, sticking with 1920x1080 resolution, using DVI or HDMI ports, what my trusty Viewsonic display supported.

Just recently I got the itch to move to 4K and ordered a new monitor. The Dell P2417Q has arrived and it is very nice with all the details I could never see before. While trying to achieve 4K @60Hz I discovered that neither of the display ports are actually working.

I got this HD 7950 off eBay a couple of years back, and it is just an average joe card flashed by some dude, not the official Sapphire one.

Is there a way to enable the display ports?

Also, would it make more sense to get a GTX Pascal now that drivers are available for OS X instead of messing with this older card.

Your advice would be appreciated.

 

[Filin]

Seems you have non-reference design card flashed with original Sapphire Mac bios (but not sure). You should check card PCB layout.

 

[h9826790]

It's quite unusual that HDMI port work but both mDP don't. Did you check the cable? Or use the mDP with other display?

Anyway, you CANNOT boot a Mac EFI 7950 at 4k 60Hz. You have to do it either 4k 30Hz (force the monitor run at DP 1.1), or boot from the non Mac EFI ROM.

 

[Gazember]

Unfortunately, this is the only monitor and cable I have to test with. I think I will wait for the Nvidia Volta and ADM Vega roll out and see where drivers and prices will land for a new card. I can live without boot screen, but not with graphics artifacts. Hopefully the last upgrade before the modular mac arrives.

Thanks