2017 27" iMac 5K (RP570) [7th,4C] + RX 5700 XT @ 32Gbps-TB3 (Razer Core X) + mac...
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2017 27" iMac 5K (RP570) [7th,4C] + RX 5700 XT @ 32Gbps-TB3 (Razer Core X) + macOS 10.15.4 [Aiwi]  


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Joined: 3 years ago

System specs (model inc screen size, CPU, iGPU, dGPU, operating system)

  • 2017 27" iMac 5K
  • 3.4GHz Quad-Core i5 7500
  • 32GB DDR4 2666MHz
  • AMD 570 4GB dGPU
  • macOS Catalina 10.15.4

eGPU hardware (eGPU enclosure, video card, any third-party TB3 cable, any custom mods)

Hardware pictures (note: require 5+ posts for "attach files" button to appear. Or can link from say http://imgur.com )

  • I'll need some more posts for this
  • Basically an iMac with a Razer Core X on the right side

Installation steps (what did you do to get it all going?)

  • Idle at macOS desktop
  • Plug in the eGPU
  • Everything works!
  • Set eGPU preference for chosen apps
    • Right-click on app
    • Choose Show Info
    • Choose Prefer External GPU
  • All set!

Benchmarks (Include a CUDA-Z or AIDA64 bandwidth pic. Optional: Valley, 3dmark, noting if it's on internal/external LCD )

  • CS:GO - Internal Screen

  • Divinity Original Sin 2 - Internal Screen

    • 1440p - Ultra Settings

      • Radeon Pro 570 avg: 45 fps

      • Radeon 5700 XT avg: 60 fps (capped despite v-sync and frame cap off)

    • 5K - Ultra Settings

Comments (eg: how has the eGPU improved your workflow or gaming)

  • I'm not sure I think it's ideal to buy a Radeon 5700 XT for gaming in macOS on a 2017 5K iMac, in particular with internal monitor acceleration.
  • My tests using an RTX 2070 in Windows 10 yielded better results. But the convenience of staying in macOS is hard to beat.
  • In some games, like CS:GO, the eGPU rendered a huge performance loss at 1440p, Low settings.
  • I would probably suggest setting up a gaming server and streaming from it instead, to be honest.
  • Moonlight streaming or Parsec gives amazing performance from my decade-old Mac Pro with a Xeon X5690 and RTX 2070. This way my iMac runs cool and the heat is generated somewhere else in my house.
  • The only problem with streaming is the iMac GPU's HVEC hardware decoder being limited to max 4K. (So, no 5K streaming) 🙁


2017 27" iMac 5K (RP570) [7th,4C] + RX 5700 XT @ 32Gbps-TB3 (Razer Core X) + macOS 10.15.4 [build link]  

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