[Daniel Bull]

I thought there were potential issues with using different GPUs for the same application, but these benchmarks are showing multiple different GPUs.

https://render.otoy.com/octanebench/results.php

Are these bridges GPUs, or just simply two GPUs assigned to Octane Render via the software controls? If this is the case, could I dedicate 2 (or more) GPUs to Octane, whilst keeping my primary GPU for all other applications? Ergo:

Quadro 4000 (primary GPU for most applications and display) Titan X (secondary GPU for Octane) GTX 750Ti (tertiary GPU for Octane)

Would this work? Would I need to somehow bridge the secondary and tertiary GPU? Or would Octane simply use the Titan X, then switch to the GTX 750Ti if and when it ran out of memory with the Titan?

[Daniel Bull]

Hi Walter,

What about multiple GPUs?

As i understand it, one can stack GPUs up for Octane to use so long as they are the same card?

Would I be able to do this with a different secondary GPU from my main GPU? So that my setup could theoretically be:

Quadro 4000 (primary) GTX 980Ti (secondary) GTX 908Ti (tertiary) GTX 908Ti (etc…)

Of course I know i would have to get extra power supply installed to handle these extra GPUs – but is this possible? Is it advisable?

If this is the case, would you recommend getting one Titan X? Or two GTX 980Tis? Or even 4 GTX 750Tis with 4GB?

[Daniel Bull]

Nope Didn’t work.

Ay other suggestions?

[Daniel Bull]

i hope so. I haven’t looked in the control panel. But let me know if you find out.

[Daniel Bull]

i hope so. I haven’t looked in the control panel. It would be ace if one could, but I doubt it will be this easy…

[Daniel Bull]

Hi Walter,

Thanks for your reply.

I don’t think multiple GPU installs are particularly rare amongst 3D designers, and actually, not even that rare amongst gaming and computer enthusiasts either. Basically, I think as a proportion of people who would access and use forums such as these, I expect multiple GPU users to be comparable to single GPU users. But anyway, that’s by the by really.

I’m not really interested in CUDA performance. None of the softwares I use exclusively rely on CUDA or OpenGL instead of openCL (as i understand it). The problem is that I NEED a secondary GPU. Octane & TurbulenceFD pretty much state that it is a necessity, and certainly users report this being the case. BUT, as I don’t have the money to purchase 2 Titan Xs or GTX 1080s, I am exploring this option, which just so happens to be an elegant solution which boosts my Maya performance.

So are you saying that I am going to run into problems if I install 2 different GPUs in my computer? And is it easy to patch GPUs to run monitors during different times? So that I can cheat running Adobe from the secondary GPU?

[Daniel Bull]

Any ideas folks???

[Daniel Bull]

Thanks for the info.

So what do you recommend for my needs?

Are C4D & Maya able to switch which GPU they use as primary?

I am a bit stumped as how to move forward with this.

Surely there are people out there that want to use Adobe (Pr & AE) (which favours nVidia) as well as Maya (which far favours AMD FirePro), and then C4D plugins such as Ocatne Render & TurbulenceFD which also both favour nVidia.

I can’t see a way of tackling this problem, other than working in one software suffering:

Either my work in Adobe is fast, and my work in Maya and C4D (Octane & TurbulenceFD) is slow (Titan X as primary GPU, and FirePro W5000, or even my existing Quadro 4000 as secondary)

Or my work in Maya & C4D is fast, and Adobe slow (FireProW5000 as primary; Titan X secondary)