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2014 27" iMac 5K (R9 M295X) [4th,4C,K] + RX 580 @ 16Gbps-TB2>TB3 (Sonnet Breakaw...
 

2014 27" iMac 5K (R9 M295X) [4th,4C,K] + RX 580 @ 16Gbps-TB2>TB3 (Sonnet Breakaway 350) + macOS 10.13.2 [secretsquirrel]  

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secretsquirrel
(@secretsquirrel)
Active Member
Joined: 2 years ago
 

 System specs:

iMac (Retina 5K, 27-inch, Late 2014), 4 GHz Intel Core i7, 16 GB 1600 MHz DDR3, 1 TB Flash, AMD Radeon R9 M295X 4 GB graphics

Built-in Retina Display @ 2880 x 1620, DELL U2715H @ 2560 x 1440 - connected mDP->DP cable

macOS 10.13.2 (17C88)

 

eGPU hardware:

Sonnet eGFX Breakaway Box 350

Sapphire Nitro+ Radeon RX 580

Apple Thunderbolt 3<->2 adapter, white Apple Thunderbolt cable 2m, DisplayPort -> Mini DisplayPort cable 1m

 

rx580 infos

 

Installation steps:

The installation process was quite simple, assembled the eGPU enclosure, attached the cables ->

  1. Attached the graphic card DisplayPort with an DisplayPort->Mini DisplayPort cable with my DELL U2715H monitor
  2. Connected the Apple Thunderbolt 3<->2 adapter and the white Apple Thunderbolt 2m cable
  3. Turned on external monitor
  4. Turned on iMac
  5. Connected the Tunderbolt cable with the iMac
  6. Received a prompt from macOS that an external GPU was detected and I should log out to begin using the external GPU
  7. Logged out and logged in again and the eGPU was working under macOS, the eGPU is recognized as AMD R9 xxx 8 GB

 

Benchmarks:

Here some benchmarks:

LuxMark v2.1 (sala scene):

  • eGPU RX580: 3749
  • iGPU R9 M295X: 1935

LuxMark v3.1 (luxball scene) - macOS: 15473

luxmark31 egpu macos

 

Unigine Heaven Benchmark 4.0 @ 2560x1440 8xAA fullscreen - Ultra - macOS:

  • eGPU: FPS 25.6, Score 645, Min FPS 11.5, Max FPS 41.0

heaven egpu macos

  • iGPU: FPS 15.7, Score 395, Min FPS 8.2 Max FPS 27.2

 

Unigine Heaven Benchmark 4.0 @ 2560x1440 8xAA fullscreen - Ultra - Bootcamp Windows 10:

  • eGPU: FPS 49.9, Score 1257, Min FPS 8.3, Max FPS 89.8

heaven egpu windows

 

 

 

Comments:

This eGPU build is my second attempt and works out of the box without any hassle, just plug'n play.

My  first attempt with the HP Omen Accelerator didn't end so well.

The Omen was never recognized and it never turned on. I assume that my Omen was delivered with an older firmware, but due the lack of a native Windows PC with Thunderbolt 3 ports I couldn't verifiy this and I replaced the Omen with the Sonnet Breakaway Box, which is by the way much smaller than the Omen.

 

This eGPU setup with the same connections also works on a

Macbook Pro (Retina, 13-inch, Mid 2014), 2,6 GHz Intel Core i5, 8GB 16000 MHz DDR3 with Intel Iris iGPU on macOS 10.13.2 (17c88).

 

If you have any question or further remarks, please don't hesitate to ask...

secretsquirrel

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


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nombrescreeno
(@nombrescreeno)
Trusted Member
Joined: 2 years ago
 

All of this was done on the external display, correct?

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


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secretsquirrel
(@secretsquirrel)
Active Member
Joined: 2 years ago
 
Posted by: nombrescreeno

All of this was done on the external display, correct?

Yes thats right...

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


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(@savvas_njovu_christides)
Active Member
Joined: 2 years ago
 

Hey! great post. Im planning a similar build.
I wanted to ask: How is the system performing after the latest update from Apple (10.13.4 if you updated). In the release they state that egpu support for thunderbolt 2 has been dropped.

Thank you.

iMac 5K Late 2014 + Akitio Node Pro + Vega 64 + LG 4K UHDTV


iohanmax liked
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jadibel2
(@jadibel2)
New Member
Joined: 1 year ago
 

Hey, could you explain how you managed to make it work in windows? I’ve been trying for a while with Imac 5k late 2015 R9M390 and akitio node rx 580 and no luck! just crashing , black screen, half screen, error 12.....
I managed with MBP 2016 touch bar nicely though!
thank you very much! Not a single egpu implementation with Imacs out there!

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


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Gooze
(@gooze)
Active Member
Joined: 10 months ago
 

I am trying to do a similar build. For me Bootcamp is the most important. I have an iMac 5k late 2014 + Sonnet Breakaway 650 + AMD Radeon Vega 56.

2018 MacBook Air (OSX 14.2, Win10), late 2015 iMac 5k (OSX 14.2, Win10) + Sonnet EFX Breakaway 650 + ASUS AMD Radeon Vega56


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Haraldt1
(@haraldt1)
New Member
Joined: 10 months ago
 

Hi,

i have the same imac.
is it possible to build that without an external Monitor?
I want to speed up the internal monitor.

lg from austria
harry

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


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