Windows 10 and More than 1 Nvidia GPU; What's the Status?
Subtropic Pixel
Posts: 2,388
in The Commons
I'm not hearing anything about this reported performance problem. Has it been fixed by Microsoft or Nvidia?
Daz 3D is part of 
Connect
DAZ Productions, Inc.
7533 S Center View Ct #4664
West Jordan, UT 84084
Licensing Agreement | Terms of Service | Privacy Policy | EULA
© 2025 Daz Productions Inc. All Rights Reserved.
Comments
in the past
uninstall the drivers
power down
remove the cards from the chassis
reboot
power down
replace the cards in the chassis
reboot
install the drivers
Sorry, no; the usual solutions do not apply in this case.
The problem is slow performance in Windows 10 only when iRay rendering with more than one Nvidia CUDA card installed. Render times have been noted to be slower with 2 GPUs than they are with 1 GPU. At least one PA has noted the problem, but she had to back out her installation of Windows 10 because .. well, she had work to do; deliverables to deliver.
Not seeing anything specific in the Nvidia changelogs...
I have Windows 10 and also, NVidia GeForce w/2gb ram - and I'm not having any issues?
The issue is with using two (or more) GPUs - W10 seemed not to see the extras, so there was no speed increase as there should have been (and is on earlier versions of Windows).
That's okay, I've got some wonky thing going on where IRay seems to hate being used in CPU mode-- any attmept to do so results in access errors.
Thank you, Richard. But it was more than that. Two or more GPUs didn't merely perform "the same as" a single GPU. They performed WORSE than a single GPU. Significantly and quantifiably worse, measurable in minutes or even hours. The old term for it is "thrashing".
The reason I'm asking about this is because this issue is the ONLY issue I know of that is preventing me from moving to Windows 10 on my main workstation.
Had a look at the issue and well Nvidia know of the problem and they are working on it..
Not sure if it applies to all cards, I have 4 GPU and running windows 10. No slowdown at all, it flies.
1 Titan Z (2GPU) + 2 EVGA 780GT, This was about a month ago... now switched to hackintosh for rendering.
I can update drivers, switch to windiows 10 drive and test again if you like me to.
Nick
Hey, thanks for the generous offer, but before we start art talking about testing, let's see the specs of your rendering machine...motherboard, cpu, memory, etc.
I'd be curious to learn why you DON'T have the problem on Win 10!
My Specs are as folows.
Justed tested it a few minutes ago and it does work, test scene was simple cube and box. Just the 780 alone took 50 secons to render 300 iterations, when I added the Titan it jumed to 17 second for 300 iterations.
The machine upadted version windows 10 64bit / updated nvidia drivers. (5 Days ago)
Gygabyte Z87-OC mother board
INTEL I7 3.5 GHZ
32 GB mem
512GB SSD
Titan X with dual GPU (main Card)
ASUS 780GT
These are not the latest maxwell cards, maybe that's why they work...
The latest drivers are worth a look...there wasn't anything specific in the changelog, but that doesn't mean the problem wasn't adressed in the update. You would need to dig through all the issue/fixes numbers to figure out if it was, if it isn't specifically stated. (done that more times than I care to remember...)
Hello again...I guess I got busy back in October. Based on the two posts just above this one, it sounds like the dual GPU problem with Windows 10 may have gone away.
If more people can confirm this, I'll begin planning to upgrade my main workstation.
Is this an Iray only problem or was the original thread about windows 10 and Nvidia GPU in general?
In the latest OctaneRender for DAZ Studio plugin version 2.24.2.4
using multiple Nvidia GPU on Windows 10 pro 64 bit did yield faster render times than using just one GPU.
This means everything was working as expected when rendering a test scene using different amounts of GPU.
- - -
Test scene:
- plane
- reflective sphere
- light emitter square
- light emitter cube
Kernel used: PMC
Samples run: 2'000
Nvidia GPU used: GTX Titan
Nvidia Driver version: 359.00 (359.06 is now allready available)
Windows 10 pro 64 bit: Build 10240
(enter "winver" in windows 10 search field and run the command to display the windows build number)
Results:
With 1 GPU the test scene took 4min 3sec to render.
With 2 GPU the test scene took 2min 4sec to render.
With 3 GPU the test scene took 1min 23sec to render.
- - -
You have 3 Geforce Titan X's? Wow. Respect.
So it's working with Octane; that's super news!
Anybody using Reality or iRay?
I have my Titan X, 2 GTX 980Ti's and one GTX980 rendering at regular speed under Windows 10. Howver, it has not been easy to get W10 to play nice in a lot of areas. I've had more BSODs with it since doing a full clean install a bit over a week ago than I have had in my entire time with Win 7. I get the feeling W10 is still very betaish. The last Nvidia driver update seems to be doing pretty good now. I did have to run the special uninatalled to get rid of the Windows drivers and also I turned off updates from Windows for hardware. Anyway. I'm not seeing any slowdown, as long as W10 doesn't just do something stupid which is all too often.
Wow, oh wow.
Can you rank your 4 cards in order of fastest to least fastest for rendering done in iray? Very curious about that.
And yes, my Windows 10 laptop has been having graphic driver crashes lately, and that's even with DS not open. I could just be browsing the web and it will happen. I just updated the Nvidia drivers, but almost immediately got another graphic crash. Luckily for me these don't cause BSODs, but they are annoying.