Nvidia GTX 680 4gb 3 monitor?

[databaze]

Hi,

I have a Mac Pro 4,1 flashed to 5,1 running a Nvidia GTX 680 4gb card flashed as well.

I have 3 monitors that I would like to use, but only two come up.

The way I have them connected is:

1-24inch monitor to lower DVI port
2-30inch monitor to lower Display port
3-27inch monitor to lower HDMI port

The only one that does not come up is the 27inch connected via HDMI.

I am running Nvidia Web Driver 346.02.03f08 if it helps.

Any help would be greatly appreciated.

 

[ActionableMango]

You could try upper DVI port if you have a DVI to HDMI adapter.

Does third monitor work on other computers?

Does third monitor work if you boot up to Windows (assuming you BootCamp)?

 

[nigelbb]

Which ROM has the card been flashed with? The original 2GB ROM hacked for 4GB card has a problem with one of the DVI ports not working. Happily Fl0r!an has produced a version that allows all four ports to function (I use it with my 4GB GTX680) https://forums.macrumors.com/thread...pci-e-2-0-5gt-s.1603260/page-13#post-22712047 so this might be worth a try.

 

[666sheep]

Did you try to re-arrange displays between ports?
I would try:
– 30-inch to lower DVI
– 24-inch to HDMI
– 27-inch to DP

 

[m4v3r1ck]

I use a flashed - rom by Fl0r!an - GTX-680-FTW-4GB too:
- upper DVI HP LP2480zx
- lower DVI Iiyama T2234
- HDMI HP LP2475w
- Dp = spare

Great rom! Working flawless since then, but no info's in the "PCI" tab in System Report.

Greetz

 

[ActionableMango]

OP says it's the monitor connected to the HDMI port that's not working. Florian's ROM fixes the upper DVI port.

It's worth doing anyway to ensure the upper DVI port is active, but I don't see how it's going to fix the HDMI problem.

 

[m4v3r1ck]

That's why I mentioned my rom release and connected ports (HDMI) as in the one from Florian and changed ports to monitors randomly.

@databaze: Perhaps a bad HDMI cable?