Radeon VII on an iMac Pro: not speeding up Resolve... at all
 
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Radeon VII on an iMac Pro: not speeding up Resolve... at all  

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Guillem G
(@guillem_g)
Active Member
Joined: 7 months ago
 

Sonnet eGFX 650w + Radeon VII should have been a killer combo for my 10-core iMac Pro on OSX 10.14.6.
It is not.

Resolve runs faster using the internal Vega 56 than when used in conjunction with the Radeon VII or when using the Radeon VII alone.

Tested in HD, UHD, different formats. Both in OpenCL and Metal (much faster). Tried hooking up a display or keeping the eGPU only for compute: no difference. Using 50cm TB3 cable.
Right now having an eGPU feels useless.
Any ideas?

iMac Pro, OSX Mojave 10.14.6, Radeon VII on a Sonnet 650w eGPU


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ikir
 ikir
(@ikir)
Prominent Member
Joined: 4 years ago
 

Do you see activity monitor using it?

Maybe Catalina can help, I've seen many times issue like that fixed by OS update.

Try to isolate the issue, run a benchmark, the old Valley can be fine if you plug a display to Radeon VII. Or Geekbench justo to understand if Resolve is the issue.


MacBook Pro 13" 2020 Touch Bar M1 8-core CPU 8-core GPU - 16GB unified memory - 512GB PCIe SSD
MacBook Pro 13" 2020 Touch Bar i7 quad-core 2.3Ghz - 16GB RAM - 1TB PCIe SSD

my awesome Radeon VII eGPU
my Mantiz Venus extreme mod with Sapphire Nitro+ RX Vega 64

 
2018 13" MacBook Pro [8th,4C,U] + Radeon VII @ 32Gbps-TB3 (Mantiz Venus) + macOS 10.15 [build link]  


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Guillem G
(@guillem_g)
Active Member
Joined: 7 months ago
 

Thanks for your feedback -not a big fan of Catalina but if it may help I'll surely have to upgrade.

Can't run it on both GPUs simultaneously, but how do you see this geekbench 5 numbers?

-eGPU Radeon VII 60885 Metal Score

-internal Vega56 69086 Metal Score

-eGPU Radeon VII 56728 OpenCL Score

-internal Vega56 58329 OpenCL Score

Resolve is known for making very good use of multiple GPUs, my previous rig had 2x1080Ti and it nealy doubled the speed of a single 1080Ti... But when using both it's slower than the internal Vega 56 only...

iMac Pro, OSX Mojave 10.14.6, Radeon VII on a Sonnet 650w eGPU


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Guillem G
(@guillem_g)
Active Member
Joined: 7 months ago
 

I see regular iMacs delivering 90k+ when mine is at 60k, so the figure is indeed bad:

https://browser.geekbench.com/v5/compute/search?utf8=✓&q=radeon+vii

What can be going wrong?
Thanks!

iMac Pro, OSX Mojave 10.14.6, Radeon VII on a Sonnet 650w eGPU


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Guillem G
(@guillem_g)
Active Member
Joined: 7 months ago
 

I tried the same Sonnet 650w box on an iMac, 6-core @3,7Ghz, internal 580. With Catalina!
The Geekbench result is even worst: 55.000 in Metal for the Radeon VII.
There are no drivers or firmware for the box, i didn't install radeon drivers either. I tried different thunderbolt 3 cables... ANy idea how to. spot the issue? Thanks!

 

iMac Pro, OSX Mojave 10.14.6, Radeon VII on a Sonnet 650w eGPU


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Guillem G
(@guillem_g)
Active Member
Joined: 7 months ago
 

Do you think it'd make sense to try it on a Razer Core X Chroma instead of the 650w Sonnet I currently have?
I'm really doubting if the box may be the issue...

 

iMac Pro, OSX Mojave 10.14.6, Radeon VII on a Sonnet 650w eGPU


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Mini i5
(@mini-i5)
Honorable Member
Joined: 1 year ago
 

@guillem_g

You’re using the wrong benchmark. GB has been useless on Mac OS for some time. 

All Mac users should run the Basemark GPU for Metal benchmark.

And while an eGPU speeds up some tasks in DaVinci Resolve - that doesn’t mean it speeds up all of them on every Mac model. (The same applies to Final Cut Pro). 

Barefeats testing shows this pretty clearly.

A9C6D145 8501 4D89 B32D 670B452723A1

And here’s another example where adding an eGPU does help - when noise reduction processing is involved. (Ignore the Mac Pro comparison for the moment). 

 

43FDC243 FE67 4DA3 BE38 9CCE5B752014

 

2018 Mac Mini i5 / 6-core 3.0-4.1 Ghz / 32GB / 256GB / Intel UHD 630 / PowerColor Gaming Station / PowerColor dual-fan RX 5700 XT / Mac OS 10.15.6 Catalina / Windows 2004 😏 / Dual LG 27" 4K displays


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Guillem G
(@guillem_g)
Active Member
Joined: 7 months ago
 

@mini-i5, Thanks for getting back and providing useful info.
Barefeats has been a reference and actually one of the reasons why I purchased the Radeon VII.
I asked Rob (aka Mad Scientist) about it and he sent me really good results where the iMac pro was really delivering with an eGPU Radeon VII.

I haven't been able to replicate this performance. 2GPUs is not faster than one GPU, and the Radeon VII is not faster than the internal GPU.
When using both GPUs they don't reach 100% usage according to Activity monitor / iStats Pro.

I am wondering if it could be an enclosure issue -I've had the same findings on my assistant's 6-core iMac...
I'll post my findings.

 

iMac Pro, OSX Mojave 10.14.6, Radeon VII on a Sonnet 650w eGPU


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jalyxander
(@jalyxander)
New Member
Joined: 1 year ago
 

@guillem_g, Did you ever figure this out? I’ve had a Radeon VII since release using it with my Razer Core X Chroma attached to a MacBook Pro 2018 (max spec) for use with Davinci Resolve and I saw practically no increase in performance as I’ve seen benchmarked online.

Radeon VII has basically ended up being used for gaming on an external bootcamp partition.

Would like to figure out how to fix this issue for my professional workflow however.

 

 

 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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Guillem G
(@guillem_g)
Active Member
Joined: 7 months ago
 

@jalyxander, unfortunately i never got it to work. Same scenario.
eGPU may be useful for gaming but competely unusable for Resolve IMHO...
🙁

 

iMac Pro, OSX Mojave 10.14.6, Radeon VII on a Sonnet 650w eGPU


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