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Black screen 780GTX on a Mac 5,1

C10-x

C10-x

macrumors newbie
Original poster
Sep 5, 2017
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I'm not sure if this the correct forum but, I finally installed my 780GTX on my Mac 5,1 with 2x6pin and installed the latest High Sierra updates and Nvidia Web Drivers, I hear the chime and I think it boots just fine but without video. I'm using DVI to my Monitors. I'm not sure if I'm supposed to do any more than that as there's not a lot of info on my 780GTX. What's my next step?
 
C10-x said:
I'm not sure if this the correct forum but, I finally installed my 780GTX on my Mac 5,1 with 2x6pin and installed the latest High Sierra updates and Nvidia Web Drivers, I hear the chime and I think it boots just fine but without video. I'm using DVI to my Monitors. I'm not sure if I'm supposed to do any more than that as there's not a lot of info on my 780GTX. What's my next step?
Click to expand...

Do you have anything can remote login the 5,1? e.g. Another Mac via the native screen sharing. Or use any mobile phone / PC via VNC (Google Remote Desktop is one of the free and very good software for this purpose).

If you can remote login, then you can see if the card is working.

If no, then it will more complicated. Because we have no idea if your card is working, or the cable has problem. Or if the software is corrected install etc.

Anyway, did you check if Nvidia web driver is selected BEFORE you swap the 780 in?
 
Good advice above^

Any reason it could be the DVI port? Some flashed ROMs knock that port out on the 680s.
 
GTX 780 should work perfectly fine on any recent macOS with stock drivers, your 2x6pin cables are most likely the culprit (the 8pin is not optional!).
 
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Fl0r!an said:
GTX 780 should work perfectly fine on any recent macOS with stock drivers, your 2x6pin cables are most likely the culprit (the 8pin is not optional!).
Click to expand...
. Oooohh okay, yeah the leds is green and red but where do I fit a 8pin?
 
C10-x said:
Yeah it's a 6 pin 8 pin but from what I read your can just use a 6 pin in the 8 to supply enough power.
Click to expand...
It's not just the power, there's a sense pin to tell whether a 8pin is plugged in. If you leave those additional 2 pins empty, the card won't start up.

Get a 6pin to 8pin adapter cable if you're willing to risk frying your motherboard (usually won't happen, but you're certainly out of spec). Otherwise use SATA power.
 
Fl0r!an said:
GTX 780 should work perfectly fine on any recent macOS with stock drivers, your 2x6pin cables are most likely the culprit (the 8pin is not optional!).
Click to expand...

I think there are some Rev B GTX780 out there, which won't work with the native Apple driver, but I am not 100% sure about this.

Anyway, I agree OP should check if he power the card correctly. Using only 6+6 to power 6+8 is fine (at least should be OK no the reference GTX780), however, a correct cable (combination) should be used.
 
h9826790 said:
I think there are some Rev B GTX780 out there, which won't work with the native Apple driver, but I am not 100% sure about this.
Click to expand...

this was true up until and including 10.11.6 el cap

but with 10.12 and up Apple finally updated the NVIDIA drivers somewhat (im guessing for better metal compatibility) and while we did not get maxwell/pascal support sadly, we did at least get better/full support for all the kepler GPUs out there, so if your running 10.12 or up its best to stick with the stock drivers if your running a kepler or older card.
 
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owbp said:
Does the same applies to 780 ti and Titan (GK110)?
Click to expand...

yep it should work fine :)

the stock drivers in 10.12-10.13.2 at least, are based on the 355 driver branch and so all the kepler and older GPUs that it supports should work fine. (Note the Tesla architecture drivers in OS X, for cards like the GT 120, the GeForce 9400 and GeForce GTX 285 etc are based on the 310 driver branch)
 
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you need a 6 pin to 8 pin cable, without that you will not be able to use your card!
like this one
75084.jpg

so apple 6 pin to 6 pin then pc 6 pin to 8 pin then 8 pin end in to GPU.

i use the 6 to 8 pin that was in my GPU box.

ps cool to know the GTX780 drivers are working now, used to be only revision a cards that worked and revision B where door stops in a macpro with osx
 
C10-x said:
I'm not sure if this the correct forum but, I finally installed my 780GTX on my Mac 5,1 with 2x6pin and installed the latest High Sierra updates and Nvidia Web Drivers, I hear the chime and I think it boots just fine but without video. I'm using DVI to my Monitors. I'm not sure if I'm supposed to do any more than that as there's not a lot of info on my 780GTX. What's my next step?
Click to expand...

I’ve been using an EVGA Nvidia 780 GTX 3g the past 2 years and has been working fine. No freezing or sudden shuts downs. Using a 6 pin to 8 pin and a 6 pin to 6 pin power cables. No adapters. On the 6 to 8 pin cable, the 8 pin end plugs directly to the GPU’s 8 pin port and the 6 pin end plugs to the motherboard. I am only using the native OSX drivers on Mavericks 10.9.5. The 780 GTX also worked fine on Yosemite 10.10 and Mountain Lion 10.8.5 on my other boot drives. I don’t have El Cap or Sierra.
 
Sorry to revive this old thread but...
I have tried everything to get my non flashed GTX 780 6gb to work in my 5,1 Mac Pro. I am using the mini 6 pin to 8 pin adapter and the mini 6 to 6 pin. I’m on High Sierra 10.13.6 and runnng the latest cuda and Nvidia web drivers.
All I get is a black screen no matter which port I try and use.
I’ve tried running screen share, and it shows that it’s not recognizing the video card. Just showing it as “Nvidia chip set”
I can’t figure out what I’m doing wrong...
(P.S. I have the IT department at my work double check to make sure that the card was working in everything. It tested out just fine.)
 
All the info is below in the attached pics. :)
Oh and only running 1 gpu. The quadra 4000 is what I currently have running.
 

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I tried uninstalling the driver and reinstalling it through the script. Still get a black screen with the GTX 780 6gb installed.
I’ve even tried installing earlier version of High Sierra to see if they would work and still get black screen.
I used the screen sharing tool to see what happens with the GTX installed (see images for info)
I feel like this shouldn’t be this hard. Can you guys think of anything that I am missing?
 

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Steven84 said:
I tried uninstalling the driver and reinstalling it through the script. Still get a black screen with the GTX 780 6gb installed.
I’ve even tried installing earlier version of High Sierra to see if they would work and still get black screen.
I used the screen sharing tool to see what happens with the GTX installed (see images for info)
I feel like this shouldn’t be this hard. Can you guys think of anything that I am missing?
Click to expand...

Your card should have native support in High Sierra. Can you get anything display when using the native Apple driver?
 
h9826790 said:
Your card should have native support in High Sierra. Can you get anything display when using the native Apple driver?
Click to expand...

Yeah I had read that and every time I try, seems to get a kernel panic message.

Even if I leave the 780 in the lower PCI slot and put the quadro back in above it and try and reboot I get a kernel panic till I pull the card out completely and reboot.

I can’t really see what’s happening, but I know it doesn’t boot in because when I switch it too the Native driver and reboot I never reestablish my remote connection to the other Mac I am using. Then I have to pull the card and put my Quadro 4000 back in and start over.

upload_2018-10-14_14-17-31.png


The 780 has 1 8 pin and 1 6 pin port. I am running one mini 6 to 6 pin (stock cable) and one mini 6 to 8 pin to the card. Which from everything I’ve seen and read that is the correct set up.
 

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