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Posted: Tue Jul 21, 2020 8:33 pmPosted: Tue Jul 21, 2020 8:46 pmPosted: Tue Jul 21, 2020 10:06 pmsszyszka wrote:I'm sorry if this has already been covered, I can't track it down. Will it be possible to use multiple eGPUs? I really kinda love the idea of my 13" MBP with 4 Pro VII's attached...
-Seb
http://sebastianszyszka.com
Posted: Tue Jul 21, 2020 10:11 pmLeandersson wrote:Goldorak wrote:Leandersson wrote:Super exciting and congratulations on the release!
Got a question.
I was curious and wanted to render the exact same C4D scene on my PC with two RTX 2070 Super and then using my 2019 MBP with a Vega 56 EGPU to see the speed difference.
Very far from a fair comparison since the PC setup got about 439OB and the Vega 56 currently got around 117OB. So the speed difference should be around 4x, probably more now since it's early days.
I rendered and the result of the final images are identical down to the pixel, very impressive.
However, the PC rendered the image in 2:15 and it took the MBP 75:12. So PC was around 33x faster.
Is this due to the PC being much more powerful with more memory and better CPU or is an EGPU solution just that much slower?
Guessing there's a lot of lost performance with EGPUs.
Was RTX on and did you have to go out of core on macOS? Those two factors could easily affect speed depending on the scene and kernel settings used.
Don't think I went out of core but RTX was indeed active, that's probably why.
Thanks for the reply and congrats again, really excited to be able to bring Octane on the road.
Posted: Tue Jul 21, 2020 10:17 pmPosted: Tue Jul 21, 2020 10:39 pmGoldorak wrote:Yes, should work fine! I tested with 4x R7 on an iMac Pro for many months.
Posted: Tue Jul 21, 2020 11:30 pmPosted: Tue Jul 21, 2020 11:53 pmcjadams wrote:The good news is that with compute versus playing video games the amount of data that's being shuffled is a lot less than trying to keep up with frame rates. So in theory we should be able to do fairly well but not lose a lot of performance even if we use up two cards on both buses. I think any comments from people who've actually done it would be good. I don't have enough GPUs here to test. I remember this being part of a discussion on bandwidth limitations with the eGPUs on a forum some other place (egpu.io) maybe...I can't find the link at the moment.
Posted: Wed Jul 22, 2020 12:28 amPosted: Wed Jul 22, 2020 1:14 amGoldorak wrote:Juanjo is updating octane X studio for houdini, it will be on the list shortly. Sorry about that. The enterprise build is there.