Connecting eGPU to Mac Pro 6,1 (2013)

If you have followed previous guides and your eGPU graphics card is already mounted inside the chassis and prepaired Mac Pro 6,1 (2013) to use with eGPU then you can finally connect your eGPU to your Mac Pro 6,1 (2013) and start using it.

Step 1 Look at the back of the eGPU chassis. From the left side you will find black power button. Under it there is a red external power supply connector. On the bottom on the left there is Thunderbolt 3 connector and next to it there is a USB-C connector (10 Gbps) which you can use for all your USB accessories and use faster speeds than standard USB ports inside Mac Pro 6,1 (5 Gbps). Our MSI GeForce GTX 1080Ti got 2x HDMI connectors, 2x DisplayPort connectors and 1x DVI-D connector. You can use any of these to connect your display.

Step 2 First connect Apple Thunderbolt 3 to Thunderbolt 2 adapter which will make our chassis compatible with Thunderbolt 2 in a Mac Pro 6,1 (2013). If your eGPU chassis is using Thunderbolt 2 you can skip this step.	i

Step 3 Connect Thunderbolt 2 cable to our Apple Thunderbolt 3 to Thunderbolt 2 connector (side doesn't matter).

Step 4 Connect the other end of the cable to the 5th Thunderbolt 2 port inside Mac Pro. WARNING: If you connect your eGPU to other Thunderbolt ports than 5 or 6 it won't work! Also make sure not to connect anything to port 6. You can use all remaining ports 1, 2, 3 and 4. Please note ports 1,2 and 3,4 share the same bandwidth.

Step 5 Connect external power supply to the red power supply connector. Also connect external power supply to power outlet.

Step 6 Connect your display to any of the graphics cards connectors (2x HDMI, 2x DisplayPort or 1x DVI-D).

Step 7 Push the power button on the back of the eGPU chassis.

Step 8 Front power LED will light up.

Step 9 If you plan to use Windows with a single display connected to eGPU you also need to plug OWC (or other brand) dummy display into Mac Pro HDMI port. Without it Windows 10 build 1809 or later and Windows 11 won't boot (Windows 8.1 doesn't need it). Also it's not recommended to use it when you use macOS Sierra/High Sierra. Please note when having dummy display inserted you won't see Windows boot screen, but you will see Windows boot menu (if having more than one Windows or Windows with Linux installed).

Step 10 Push the Mac Pro power button to turn on Mac Pro. eGPU chassis will automatically start together with Mac Pro. It's also turning off automatically when your shutdown your Mac Pro.

Step 11 Press and hold Option (or ALT on Windows keyboard) key to see boot picker to test if the eGPU is working properly.

Step 12 You can boot macOS Sierra/High Sierra and you will see graphics card will change from standard AMD FirePro D300/D500/D700 to NVIDIA GeForce GTX 1080 Ti 11 GB. Enjoy !