OTOY Forums

Hey guys,

I would like to ask you about your experience with multi GPU setup, when using Windows 10?
It's not a question directly connected to Octane, but indirectly it is, because I have multiple cards,
for Octane rendering purposes (GTX 570, and 980 Ti), and it does not work for me very well. By
"not very well" I mean the older card just do not work at all, and the driver occasionally stopped
working, so I've decided to turn it off in settings in hope that at least the driver would not behave
this way (still testing).

It's not a great situation, because from what I know I cannot buy second 980 ti because there are none
in shops, due to 1080, and I cannot buy 1080 because it would differ form 980Ti and I could just have the
same problem as I've got now. I could also switch back to Win 7, but i would rather prefer to find a solution,
especially because of free upgrade to Win 10 period which is coming to an end very soon.

Have you maybe found some solutions, to problems like this, or at least heard when Microsoft / Nvidia / whatever,
will do something about it - if ever.

Thanks
Lukasz

just a few thoughts

the 570 normally has 1.5gb ram only, so all your scenes could not be bigger than 500 to 1GB (depending on your monitor setup) - if you use 2 cards, the maximum available ram for scenes is defined by the card with lesser ram (because both cards have to have the same information in their ram).
maybe this causes the problem? you cannot use the 6gb of the 980ti if you use the 570 as well.

the 1080 would work, but needs cuda 8, and it seems the release date is somewhere around august. so til then it's no use for octane.

Hey, thanks for the answer!

Unfortunately this is not the source of the problem. I am perfectly aware that GTX 570 has low RAM, therefore
I can only use it only on smaller scenes. In this case Octane render just refuses to render, and there is appropriate
info in the console.

My problem is based more on Win 10 + Dirext x 12 + Nividia + Multiple different GPU's conflict, as far as I know this
mixture is resulting in problems just like the on I am writing here about. Windows just does not recognize one of the
cards.

My question is if anyone of You experienced this kind of problem, and maybe know something more about it?

Thanks
Lukasz

Have you tried cards in different slots, and resetting your bios? My MSI motherboard was weirdly particular about such things when I set up my Win 10 system. Days of troubleshooting, 4x MSI 980TI on a splitter + 1x MSI 970. And these cards are not that different, in fact everything made by MSI. Still I don't understand why it works and doesn't work, I just tried lots of combinations and kept resetting the Bios. Was a real head ache setting up, but glad to have it going now.

I had both my rendering rigs on Windows 10, turned out to be a complete disaster. Whatever combination of drivers I tried, nothing worked. Constant driver crashes., even the PC freezing.

Went back to 8.1 on both and now all is good again.

Do not go to Windows 10.

My win10 rig works fine (GTX 460 main + GTX 770)
I did had to change a bit the registry to fix the TDR error.

Strange! At home I currently run a 980ti plus 2 x Titan blacks, Win 10 Pro, no issues at all, been working perfect.

Synthercat wrote:My win10 rig works fine (GTX 460 main + GTX 770)
I did had to change a bit the registry to fix the TDR error.

Any link/instructions how to change that ?

Thanks

If I put a monitor on any of my secondary GPUs, Octane will blue-screen crash me out of windows. I'm on Win 10, I don't know if 8 would be better about that. Anyway, I can put plenty of monitors on my primary 980 TI and its not a problem. Other than that, Win 10 has worked fine with 5 GPUs for me.

Hello,

In case you did not solve the problem, i think that i have the answer that you need.

I've upgraded also to Win 10 from 8.1 when it was released. And at that time i had on my pc a Quadro 2000 and one GTX780. Quadro for display and 780 for rendering.
While i was on Win 8.1 all was fine, both card worked well together. The minute i switched to Win 10, the system (and Octane) could only see the card that i was booting on (monitors plugged in to that card and made as primary in Bios).

I looked in the forums, on Nvidia's troubleshooting page for drivers and i even contacted them for support. The answer that i found and also the one that i received from them is that you the drivers for win 10 can not use in the same time older GPU with newer GPU. You can not mix Maxwell with Kepler. And the Quadro is Maxwell (like your 570).

Did you tried using only one card at a time?

After this i dismissed the Quadro and i got a newer GTX 750 TI for display. Now all is working fine.

Hope this helps.

BR
Marius.