upgraded from 10.12 to 10.13 - bad graphics now

[adam9c1]

I have a cMP 2012 with ATI 5870 and a nVidia Gt430 video adapter.
All screens are very glitchy and unusable. I've removed the 430 and installed quadro 2000.

System runs fine with just the ATI card.
Installed a second 5870 and tried to power up both using single power connector and they won't display video.

Is there a nVidia driver I can install?

I'm used to having more than two monitors.

 

[bookemdano]

Are you running High Sierra? There have been reports of issues with two installed GPUs. Can you try just the 5870 and see how that behaves? Similarly, just the GT 430?

 

[adam9c1]

Are you running High Sierra? There have been reports of issues with two installed GPUs. Can you try just the 5870 and see how that behaves? Similarly, just the GT 430?

It all looks fine with the single 5870. I'm in the process of backing up my files and will be migrating back to 10.12 on this box.

 

[Freakshow69]

Don't know if this helps but, I also have a 2012 12 core with a gtx 980ti with two monitors and I use this site to download the appropriate drivers https://www.tonymacx86.com/forums/graphics.13/

 

[ActionableMango]

I'm used to having more than two monitors.

5870 can do three monitors by itself.

 

[Macschrauber]

and 5870 would need both PCIe Power cables

 

[MIKX]

Right now I'm running High Sierra 10.13.6 on an M.2 NVMe Samsung 960 EVO with a flashed HIS 5870.
No problems at all.

 

[adam9c1]

What about two 5770's?
[doublepost=1533698490][/doublepost]Installed two Apple 5770's and now only 1 memory stick is operational (the other 3 show red lights).

What gives?