2015 27" iMac 5K (R9 M390) [6th,4C,] + Radeon VII @ 16Gbps-TB2>TB3 (Razer Core X...
 
Notifications
Clear all

2015 27" iMac 5K (R9 M390) [6th,4C,] + Radeon VII @ 16Gbps-TB2>TB3 (Razer Core X) + macOS 10.15.2 [Koncept_Zero]  

  RSS

(@koncept_zero)
Eminent Member
Joined: 4 months ago
 

System specs

27"  iMac  late 2015 17,1, (thunderbolt 2)

3.2 GHz Quad-Core Intel Core i5

32GB Ram

1 TB Fusion

AMD Radeon R9 M390 2GB

MacOS Catalina 10.15.2

 

eGPU hardware

Razer Core X

XFX  AMD Radeon VII

Apple TB3->TB2 adapter + OWC 0.5m TB2 -> TB2 cable

Display port cable to Samsung UE590 28" 4k monitor

 

Installation steps

Followed the steps outlined here:  https://github.com/mayankk2308/purge-wrangler/blob/master/README.md

For disabling the SIP, I left out the "$" in the instructions linked above. This maybe code speak that I was to ignore regardless.

 

Benchmarks

I bought this egpu purely for 4k video work in davinci resolve. I am curious about gaming, so I've included a few gaming benchmarks. I've yet to really get into Davinci Resolve with this setup, but I will update this post once I've done so.

Geekbench 5 scores. This a massive difference between Metal and OpenCL. With the 5700xt and RX580, there wasn't such a large gap between Metal and OpenCL.

 

Geekbench 5 OpenCL with internal display accelerated:

 

The following benchmarks are with the external display accelerated:

Comments

I've previously tested the 5700XT (returned it) and the Sapphire Pulse RX580. The 580 is a solid card and outperformed the 5700XT in all but the Unigine tests. The VII just went on sale and I really wanted a 16gb card as I work with 4k media. So far in all tests it's blowing the doors off both of those cards. Hopefully in Davinci Resolve 16 I'll really see a bump. Yes, I have the fan issue when in sleep and turned off. I don't find it annoying as I've disabled sleep mode and I rarely turn off the machine but whenever I do I'll just turn off the Razer Core X.

For comparisons sake, here is my 5700XT build: https://egpu.io/forums/builds/2015-27-imac-r9-m390-6th4c-xfx-5700-xt-16gbps-tb2tb3-razer-core-x-macos-10-15-1-koncept_zero/

Here is my RX580 build: https://egpu.io/forums/builds/2015-imac-171-6th-4c-i5-skylake-amd-rx-580-20-gbps-tb2-razer-core-x-macos-catalina-10-15-1-for-davinci-resolve-tested-5700-xt/

This topic was modified 4 months ago

2018 Mac Mini (8th,6C,B) + Radeon VII @ 32Gbps-TB3 (Razer Core X) + macOS 10.15.2


Mini i5 liked
ReplyQuote
(@koncept_zero)
Eminent Member
Joined: 4 months ago
 

I've found that if I disconnect the egpu from the menu at the top of the OS, I can sleep the mac. Then I just turn off the egpu. When I wake up the mac, I then flip the switch to the egpu and the 2nd screen turns on. Simple as that. No fan issue.

This post was modified 4 months ago

2018 Mac Mini (8th,6C,B) + Radeon VII @ 32Gbps-TB3 (Razer Core X) + macOS 10.15.2


Mini i5 liked
ReplyQuote
(@koncept_zero)
Eminent Member
Joined: 4 months ago
 

Davinci Resolve 16 is still not good with my setup. Even after making optimized media and render cache. It's got to be the tb2, CPU, and lack of pcie ssd that's holding it back as the egpu isn't getting much use.

For gaming, this setup is great, even in Mac Os.

2018 Mac Mini (8th,6C,B) + Radeon VII @ 32Gbps-TB3 (Razer Core X) + macOS 10.15.2


ReplyQuote
itsage
(@itsage)
Illustrious Member Admin
Joined: 3 years ago
 

@koncept_zero Which internal drive does your 2015 27" iMac have? If it's a Fusion setup, the internal PCIe drive slot can be used. It's actually PCIe 3.0 so you can take advantage of the highest performing NVMe drives available. The required component is Sintech NGFF M.2 nVME SSD Adapter.

 

external graphics card builds
best laptops for external GPU
eGPU enclosure buyer's guide


ReplyQuote
(@koncept_zero)
Eminent Member
Joined: 4 months ago
 
Posted by: @itsage

@koncept_zero Which internal drive does your 2015 27" iMac have? If it's a Fusion setup, the internal PCIe drive slot can be used. It's actually PCIe 3.0 so you can take advantage of the highest performing NVMe drives available. The required component is Sintech NGFF M.2 nVME SSD Adapter.

 

Yes it's the 1tb Fusion. I think I'm goign with a mac mini setup. The 2015 is just not worth spending money on outside of the egpu imo.

This post was modified 4 months ago

2018 Mac Mini (8th,6C,B) + Radeon VII @ 32Gbps-TB3 (Razer Core X) + macOS 10.15.2


ReplyQuote
machman
(@machman)
New Member
Joined: 3 weeks ago
 

I have the same iMac and am looking to get a more powerful graphics card - via an eGPU - for 3D (Blender). I'm worried about disabling the SIP. Doesn't that leave your computer open to all kinds of nasty Malware? Do you have a workaround for it? Thank you

iMac (Retina 5K, 27-inch, Late 2015), 3.2 GHz Quad-Core Intel Core i5, 32 GB 1867 MHz DDR3, AMD Radeon R9 M390 2 GB, 2TB internal SSD (iFixit upgrade bundle)


ReplyQuote
(@miah_adib)
Active Member
Joined: 3 weeks ago
 

@koncept_zero, Even with the cap at 16gbs did hooking a external monitor help with bandwidth so You can use the egpu and the graphics card in it

 

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


ReplyQuote
joevt
(@joevt)
Noble Member
Joined: 3 years ago
 

@miah_adib, you can search the build guides for builds that use Thunderbolt 2. I think they perform well compared to Thunderbolt 3 builds with the display connected to the eGPU.
https://egpu.io/best-external-graphics-card-builds/

 

 

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


ReplyQuote
(@miah_adib)
Active Member
Joined: 3 weeks ago
 

@joevt, I HAVE USB-C 3.1 though

 

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


ReplyQuote
(@koncept_zero)
Eminent Member
Joined: 4 months ago
 
Posted by: @machman

I have the same iMac and am looking to get a more powerful graphics card - via an eGPU - for 3D (Blender). I'm worried about disabling the SIP. Doesn't that leave your computer open to all kinds of nasty Malware? Do you have a workaround for it? Thank you

I had no issues with SIP disabled. I sold this computer a couple months ago but I'm not sure if you can reenable it after the fact. Run an anti-virus software if you're concerned.

 

Posted by: @miah_adib

@koncept_zero, Even with the cap at 16gbs did hooking a external monitor help with bandwidth so You can use the egpu and the graphics card in it

I'm not sure what you're asking but I only used this setup with an external monitor and had decent results. I sold this computer a couple months ago and got a 2018 Mac Mini. I've found the biggest bottleneck for my use was CPU not USB port (TB3 vs TB2.) When I upgraded to a mac-mini and paired it with my Radeon VII, I saw little improvement with pure graphics performance.

2018 Mac Mini (8th,6C,B) + Radeon VII @ 32Gbps-TB3 (Razer Core X) + macOS 10.15.2


ReplyQuote