Recognising two different GPUs in NON-SLI - Having Difficulties

[BabyJenny]

Hey all!

I recently put together a new comp, and I'm trying to run two different GPUs at the same time (for GPU rendering) The renderer I'm try to use supports it, but my computer is having a hard time overall making this happen. The only drivers I have installed are the 980ti's drivers, and it seems like the quadro is functioning with them (10.18.13.5891).

I'm trying to run:
1. top sli slot (closest to CPU): Quadro 6000 (old 2gb model)
2. bottom: gtx 980 ti

The quadro had to be on the top, because of how huge the 980ti is. That size, coupled with my CPU heatsync meant that the quadro had to go up top.

Because the quadro is up top, I have to have at least one monitor plugged into it, so I can edit bios. Otherwise it doesn't seem to display. However when I load up windows and look at the device manager, the 980ti has an exclamation mark next to it saying that it failed to load. Also all the monitors plugged into the 980 are undetected by windows.

In order to get the monitors working on all ends, I have to disable the quadro, reboot, then once I'm in windows re-enable the quadro. So far i've had to do this process for each time I've rebooted (aka need to reboot twice, so i can disable the Quadro).

Is there a proper workflow for this, or something I could change to make it work properly?

Running:
asrock x99x fatility killer
5820k
32 gb ddr4 ram

Thanks a ton!
Mike

Once I do that however, vray can't recognize the quadro as a resource for rendering.

 

[oobymach]

I assume your not using an sli cable, what version of windows are you using? Have you tried manually updating the driver for the 980 in the device manager (point it to where the driver is, don't do it auto)?

I've used dissimilar cards before successfully but they were both from the same gen (700 series, had the lower end card dedicated to physx and both enabled for cuda, no sli cable).

 

[BabyJenny]

Hey!

I'm running windows 10, without an SLI cable. I went into the device manager and tried to update, and it said i'm all up to date.

 

[oobymach]

Found this on another site.

NVIDIA cards have two separate (and incompatible) classes/model versions. Although they may have worked together in previous versions of windows, they will not work in Windows 10. Fermi class cards, which means all 500 and below and some 600 series cards cannot be used in Windows 10 with Maxwell class cards - some 600 and all 700 series cards and up. Windows 10 will not load Fermi and Maxwell drivers at the same time.

Please see this page for details: http://nvidia.custhelp.com/app/answ...dia-display-driver-for-my-older-graphics-card

This is not an issue with Different SLI. This is not necessarily an issue with NVIDIA drivers. This is an issue with Windows 10 not being able to load WDDM 1.3 mode drivers and WDDM 2.0 mode drivers simultaneously. It won't even work with Microsoft's native drivers. I was really disappointed when I followed all instructions and everything seemed to be working until I looked at device manager and saw the driver for my second card wouldn't load. Sadly, I'll have to forgo using different sli until my husband upgrades his GPU again. Good luck to all.

http://www.techpowerup.com/forums/threads/sli-with-different-cards.158907/

 

[SoNic67]

You need to install GeForce drivers on your system for both cards. Quadro will accept GeForce drivers, but the GeForce card will not take Quadro drivers. You loose a lot of "goodies" that Quadro offers.
Alternately you can get a modded inf file (google) and boot into "non-signed drivers" mode - then you can have Quadro drivers for both cards, with a small degradation in gaming performance for GTX980.

Also my mobo has in BIOS an option to select which is the order initializing video at boot time, look for that setting.

The third issue that happened to me when I tried to run a similar setup - Fermi Quadro is not UEFI compliant. If you installed Windows 10 in UEFI mode (while the newer GTX 980 card was solo in PC), you will have problems booting non-UEFI video cards due to "Secure Boot". You can disable this following this tutorial:
http://www.windowspasswordsrecovery.com/win8-tips/how-to-disable-uefi-secure-boot-in-windows-8-1-8.html

 

[BabyJenny]

Thanks Everyone!

SoNic67 the first thing you said about the GeForce drivers was correct. Before it wouldn't let me install the latest drivers I downloaded from Nvidia (but automatically installed the ones provided by windows). I think this was probably because one startup, my quadro was recognized, but it said my 980ti "had a problem." Here's the way I fixed it:

1. Open Device Manager
2. Disable Quadro (other graphics card)
3. Disable 980ti (geforce card)
4. Re enable 980 ti
5. Re-enable quadro.
6. Make sure both are working
7. Install nvidias latest drivers from website.
8. When I restarted, it recognised everything, and everything is working properly!

Thanks all!
Mike