Max number of eGPUs for 10.15 Catalina?
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Max number of eGPUs for 10.15 Catalina?  


Estimable Member
Joined: 3 years ago

Any tests or thoughts on the max number of eGPUs allowed in Catalina, MacOS 10.15 now that Apple is somewhat serious about GPU power with the new Mac Pro? Debating about converting to metal/coreML...

2019 Mac Pro (RP580X) [10th,16C,W] + RTX 3090 @ 32Gbps-TB3 (Razer Core X) + Win10 20H2 [build link]  

Noble Member
Joined: 3 years ago

Radeon Pro Vega II Duo will have a lot of computing power, no doubt about that. It will probably lose in most games against a superclocked GTX 1080 Ti, but this isn't most likely the point. The computing power will be superb.

This post was modified 2 years ago

2018 15" MBP & 2015 13" MBP connected to RTX2080Ti GTX1080Ti GTX1080 Vega56 RX580 R9-290 GTX680

2018 15" MacBook Pro (RP560X) [8th,6C,H] + RX 5700 XT @ 32Gbps-TB3 (ASUS XG Station Pro) + Win10 & macOS 10.15.4 // Navi vs Radeon VII vs GTX 1080 Ti [build link]  

Founder Admin
Joined: 4 years ago

My guess is 4 as in Mojave. I will test soon and report back.

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2020 13" MacBook Pro [10th,4C,G] + RX 6700 XT @ 32Gbps-TB3 (CM MasterCase EG200) + Win10 1903 [build link]  

New Member
Joined: 10 months ago

My rig:

  • 2019(2020 update) 16” MacBook Pro - Radeon Pro 5600M 8GB HBM2 32GB RAM 2TB NVMe SSD running Catalina
  • 3x AMD Radeon Pro Frontier Edition 16GB HBM2 (All connected through Thunderbolt enclosures) 
  • 2x Razer Core V2 for two of the Frontiers
  • 1x Aikito Node for the third Frontier
  • 1x OneStopSystems ExpressBox 3T for other devices
  • 2x PCIe RAID cards with 8TB of NVMe striped
  • 1x Thunderbolt 4x SSD RAID adapter
  • 1x PCIe 10G network adapter
  • 2x Apple Pro XDR 6K displays
  • 1x Wacom Cintiq Pro 32”
  • 1x 55” Sony XBR OLED reference TV

Getting all of this to work is a trick and requires an exact configuration where certain devices only plug into certain devices because of the way Thunderbolt works. And then when I startup my computer, I have to plug in each TB cable one by one in just the right order. It’s a total pain and god forbid I forget the order, I have to start from scratch. 

The point is you definite can get three eGPUs working connected to a MacBook Pro

My next project is to take my PCIe backplane that I used to build a super computer for another project and use its 8 slots for graphics cards. Its two host adapters will go in to identical external thunderbolt enclosures and see what happens and I’ll put 8 of the Frontier cards in it. Backplanes like that don’t have to worry about PCI  lanes because it uses PCI switching to turn the few i

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


Rafael Cichy
Active Member
Joined: 2 years ago

@themattnewman, i have a kind of the same Problem....

3x Mantiz Venus: Vega Frontier Edition

connette via OWC Thunderbolt 4 Hub

2x Razer Core: Vega Frottier Edition & RX 6800

Could you describe how do you managed it to run?


Mac mini | 6 Core | 64GB | 2TB |
MacBook Pro M1 | 16GB | 2 TB |
3x Mantiz Venus 2 / Radeon Frontier Edition | 2x Razer Core / Radeon RX 6800 & Radeon Frontier Edition |
OS X 11.4