Switching to eGPU in High Sierra. Help
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Switching to eGPU in High Sierra. Help  


Active Member
Joined: 3 years ago


This is my first experience in connecting eGPU with Mac (Late 2015 iMac on High Sierra 10.13.4).  Through the help from this forum, I was able to get my NVIDIA GeForce GTX 1080 Ti eGPU connected to my iMac via an AKiTiO TB3 node.

I used Activity Monitor to check which GPU is being used, and I found that the built-in one is the one used (Intel Iris Pro Graphics 6200).  The NVIDIA GeForce GTX 1080 Ti is sitting idle at 0% utilization.  How can I switch to the NVIDIA one without having to use an external monitor (if possible)?

Thank you!

2015 15" MacBook Pro + Apple Thunderbolt 3 to Thunderbolt 2 Adapter + Apple Thunderbolt Display 27"
AMD Radeon RX 580 + AKiTiO Thunder3 + MacOS 10.15.4

Prominent Member
Joined: 4 years ago

Hi! Welcome! This is a basic question that has been asked many times, for performance and compatibility you should connect a display to your eGPU. In this case your eGPU will accelerate everything on that display. OpenCL and Metal apps can use external GPU to accelerate internal display but it is not optimal. For sure the worst machine for an eGPU is an iMac, much more better to have a Mac mini, Mac Pro or a MacBook Pro. For example I have a 13” MBP which at home become a very powerful work and gaming machine thanks to eGPU with Lg 34” display connected.

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]