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GTX 690, Problem with Mulit-GPU "ON"... One monitor turns off.

post #1 of 6
Thread Starter 
Hi,

I originally posted this issue on the GeForce Support Forum, but unfortunately it doesn't look like a very active website. So I have found this website which is much more active, hoping that some of you could diagnose my problem.


Firstly, my configuration:

CPU: i7 3930k
Mobo: Asus Rampage IV Extreme
RAM: 32GB G-Skill
GPU: Nvidia GTX 690
OS: Windows 7 64-bit

Latest drivers installed, latest windows updates installed.

I have two monitors.

1. Samsung 40 inch LED HDTV (UE40D6500)
2. Viewsonic 22 inch (VX2268wm)

These are currently running at different resolutions.

Samsung: 1920 x 1080 60Hz
Viewsonic: 1680 x 1050 60Hz

Both of these monitors are connected to the 690 by the following connections:

Samsung: HDMI cable coming out of the TV, then going into a HDMI to DVI connector - then into the GPU.
Viewsonic: DVI cable coming out of the monitor, and into the GPU.

Please note, that I have seen "dual link" written on the Viewsonic's DVI cable - Don't know if this is useful or not.
As far as I'm aware, the Samsung is using a standard HDMI cable, and the HDMI to DVI connector is the one that came in the GPU box (I think)


I currently have Multi-GPU set to Disabled. Both of these monitors are currently connected to the GPU using these two ports:



Everything works fine. Both monitors are on, and functioning normally.
This is what it looks like in the NVIDIA Control Panel.





I have recently started to stream on TwitchTV, playing games on the Samsung monitor, and chatting with other chatters on my Viewsonic monitor.
However, with Multi-GPU being disabled, I'm not utilizing the card to it's full potential.

So therefore I would like to enable this option.
Now onto the problems that I have.

I am fully aware that I need to connect one of my monitors into a different DVI port.
I have followed this diagram.



I have now connected my monitors to my GPU using this configuration.
However, now one of my monitors is showing "no signal". (multi GPU still disabled - I have just moved the DVI connector).

Whichever monitor is plugged into this port - it receives "no signal".



This is how my Nvidia Control Panel looks now:



As you can see, both monitors are connected to the same GPU, and are also enabled according to the Control Panel, however the Samsung displays "No Signal" on the screen.
If I was to swap the DVI connections around, then it would be the Viewsonic screen that displays "No Signal".

Multi-GPU is still disabled, I will turn this on now.

This is how my Control Panel now looks... Notice that it is turned on, and ALSO notice that the Viewsonic monitor now has a green frame... What does this mean??
BTW, The Viewsonic monitor is currently the monitor that is working, the Samsung has "no signal".



So yeah, this is my problem, I can't get both monitors working when they are connected to the GPU using these two DVI slots. I have no idea what to do next?

I have tried changing the resolutions on both monitors to match eachother, still no change - still "no signal" on one of the monitors.

Does anyone have any suggestions please?
Thank You.
post #2 of 6
if your using the middle one in the row of 3 and the single one on its own then it should work.

if it does not

- plug only 1 monitor into the port that 'doesn't' work, does it start to work? if not exchange the card ASAP you probably got a dud.

if it does work with only 1 monitor then. plug in both again; and make sure that both displays are checked and active in the multidisplay setup tab.


( FYI: the green frame indicates the primary display)
Edited by noob.deagle - 1/22/13 at 8:17pm
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post #3 of 6
Thread Starter 
Hi thanks for your message.
It seems that even when using the single DVI port that is in the middle on it's own, still doesn't give the monitor any signal.

I actually ordered a Mini Display Port to HDMI cable earlier today - only about £5.00 on ebay, so worth a shot.... That will enable me to totally bypass the DVI port that doesn't seem to be working, and use the Mini DP instead. Hopefully that does the trick.

With one screen enabled, and with Multi-GPU on, the card seems to perform perfectly fine under full load. It's just the DVI port that I'm having issues with - which hopefully will be solved with the above solution.

If the new cable DOES fix the issue, I won't be to bothered about it, but if it doesn't then I will have to look into it further and consider getting the card replaced.
I have a 1 year parts warranty on the computer with the company that I purchased it from - so I still have plenty of time to figure out what's wrong - if there is actually anything wrong. I think it's going to be a little bit of trial and error.

It's a shame that I don't have two or three monitors that are exactly the same make / model. That would makes things A LOT easier.
post #4 of 6
Thread Starter 
Hi,
Just an update for anyone else that might be experiencing the same problem.

I received my Mini Display Port to HDMI adapter today.... See picture.



I replace my DVI to HDMI adapter with this, so now I am using one mini display port, and the bottom DVI port on the GTX 690, and everything is working fine.
Both monitors are displaying a signal, and "Multi-GPU" is enabled.

So to conclude, either the DVI port on the 690 is faulty, or there was some sort of conflict between using the two DVI connections - maybe I was using the wrong types of DVI. No idea, but anyway, it's working now, and now I'm happy smile.gif
post #5 of 6
Quote:
Originally Posted by AshleyUK View Post

Hi,
Just an update for anyone else that might be experiencing the same problem.

I received my Mini Display Port to HDMI adapter today.... See picture.

*snip*

I replace my DVI to HDMI adapter with this, so now I am using one mini display port, and the bottom DVI port on the GTX 690, and everything is working fine.
Both monitors are displaying a signal, and "Multi-GPU" is enabled.

So to conclude, either the DVI port on the 690 is faulty, or there was some sort of conflict between using the two DVI connections - maybe I was using the wrong types of DVI. No idea, but anyway, it's working now, and now I'm happy smile.gif

id go with that port being faulty, glad you got it working tho; if it was me id be returning it tho its alot of money to spend on a fault tongue.gif
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post #6 of 6
Quote:
Originally Posted by AshleyUK View Post

Hi,
Just an update for anyone else that might be experiencing the same problem.

I received my Mini Display Port to HDMI adapter today.... See picture.



I replace my DVI to HDMI adapter with this, so now I am using one mini display port, and the bottom DVI port on the GTX 690, and everything is working fine.
Both monitors are displaying a signal, and "Multi-GPU" is enabled.

So to conclude, either the DVI port on the 690 is faulty, or there was some sort of conflict between using the two DVI connections - maybe I was using the wrong types of DVI. No idea, but anyway, it's working now, and now I'm happy smile.gif

just a guess - sounds like a conflict between dual link dvi (capable of 120hz) and dvi (capable of 60hz) on the same card. did u try using dvi (not dvi-d) cable to Viewsonic?
glad u got it sorted out though
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