OpenCL, Cuda, or Metal?

I'm on macOS and have 3 Nvidia 1080TIs. Is there a recommendation for OepnCL, Cuda, or Metal and which should be chosen as the GPU processing mode and why?

I'm on macOS and have 3 Nvidia 1080TIs. Is there a recommendation for OepnCL, Cuda, or Metal and which should be chosen as the GPU processing mode and why?

First and most important, when your 1080Ti's still work don't upgrade MacOS.
Apple is doing a lot these days to make sure NVidia doesn't work on MacOS.

NVidia doesn't support Metal and Apple doesn't support CUDA.

So OpenCL it is.

For Davinci Resolve it makes no difference, for them it's just fp32 and fp32 only.

I'm on macOS and have 3 Nvidia 1080TIs. Is there a recommendation for OepnCL, Cuda, or Metal and which should be chosen as the GPU processing mode and why?

For your setup use CUDA. With Nvidia GPUs CUDA will almost always be faster. If you had AMD GPUs then you'd test OpenCL and Metal to see which is faster.

I'm on macOS and have 3 Nvidia 1080TIs. Is there a recommendation for OepnCL, Cuda, or Metal and which should be chosen as the GPU processing mode and why?

For your setup use CUDA. With Nvidia GPUs CUDA will almost always be faster. If you had AMD GPUs then you'd test OpenCL and Metal to see which is faster.

Not according to Rohit Gupta:

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Rohit Gupta

Blackmagic Design

Posts: 1018
Joined: Wed Aug 22, 2012 6:00 am

Re: Noise reduction CUDA vs OpenCL

PostFri Sep 28, 2018 9:18 am
This is not true at all. You should get identical results on CUDA/OpenCL/Metal.
Rohit Gupta

DaVinci Resolve Software Development
Blackmagic Design

For Davinci Resolve it's just fp32 performance that counts.

Well I get better performance with CUDA than Metal or OpenCL. That's on 2 different computers with 2 different Nvidia GPUs. Admittedly the last time I tested it was several months ago. Maybe something has changed recently with 15?

My 1080Ti on OpenCL is a POS ... only CUDA works fine on it.

First and most important, when your 1080Ti's still work don't upgrade MacOS.
Apple is doing a lot these days to make sure NVidia doesn't work on MacOS.

This is true. The OP is running a High Sierra with the Nvidia Web Driver. Such drivers have not been released for Mojave, so it's better to stick to HS for now.

NVidia doesn't support Metal and Apple doesn't support CUDA.

Kepler GPUs are still supported by Metal2, as they were featured in some iMacs. I hear it's a bit glitchy, tho. :/

So OpenCL it is.

OpenCL is also deprecated from Mojave onwards, so Metal it will be.

The only problem is that Metal2 on Mojave benchmarks pretty much the same as Metal on High Sierra. And on HS, OpenCL beats Metal.

Metal v OpenCL in Resolve/High Sierra | Metal (HS) v Metal2 (Mojave)

So, OCL > Metal2 on even ground. This is a moot point, as Apple has again eliminated competition.

CUDA wins them both, but is only applicable up to High Sierra. Maybe Turing chips will run on Metal eventually.

If you want full power out of a macOS in the future, you might want to look into AMD.

Dustin, just do go beyond osx13 and use cuda. That's all...

What about on Windows with a 2080Ti ? Still stick with CUDA for Resolve?

With a 1050ti, I found that CUDA is about 8% faster for Temporal NR.