Can I daisy-chain 3 x 4K LG UltraFine Monitors with a BlackMagic eGPU?
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Can I daisy-chain 3 x 4K LG UltraFine Monitors with a BlackMagic eGPU?  


Swisher Sweet
Trusted Member
Joined: 6 years ago

I am considering buying 3 4k LG UltraFine monitors to daisy-chain them to MacBook Pro via the BlackMagic eGPU Pro (Vega 56). According to the Apple website, I can daisy-chain 2 x 4k monitors, but I assume it is dependent on the display adapter (or even TB3 bandwidth limitations). Can I daisy-chain 3 of them if using this eGPU?

On a somewhat related note, I noticed Apple is no longer selling the Vega 56 version of the BlackMagic eGPU. Does anyone know why?

This topic was modified 2 years ago

2019 16" MacBook Pro
Blackmagic eGPU Pro (Vega 56)
27" LG Ultrafine Display

2012 Mac Pro Tower
NVIDIA RTX 2070 Super
Acer Predator X34

Noble Member
Joined: 5 years ago

@swisher-sweet, A Thunderbolt controller (whether in a Mac or in the BlackMagic eGPU) only has two DisplayPort inputs. This has been true since Thunderbolt 1. It's also true with Thunderbolt 4. Maybe someone will make a USB4 controller with more DisplayPort inputs.

Anyway, this means that the maximum number of displays you can connect to a Thunderbolt controller is two, whether you use one Thunderbolt port (with chaining) or two Thunderbolt ports.

With the Blackmagic eGPU Pro, you can chain two displays to the Thunderbolt 3 port, and connect a third display to the DisplayPort port using a Belkin Charge and Sync cable.

I guess AMD doesn't make the Vega 56 anymore?


Mac mini (2018), Mac Pro (Early 2008), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Radeon Pro W5700, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case