Crash when trying to pass through an EGPU

[simon1994]

Hello Guys,

I am quite new to Proxmox, so far i have managed to:

- set up a Proxmox host on a Desktop Machine with a Ryzen 9 7950X and a 4090
- set up a Windows 11 VM which can use the 4090 via Passthrough
- set up a Ubuntu VM that can also use the 4090 via Passthrough (but not at the same time)

I also have a Razer EGPU enclosure with a RTX 3060 that can be connected via Thunderbolt.
My Mainboard ( Asus X670E Pro Art) supports Thunderbolt, and Proxmox lists the 3060 as an available PCIe device when I connect the enclosure.

I'd like to mount the 3060 to the Ubuntu VM, so I can use both VMs at the same time with each having a GPU available.

My problem is, Proxmox completely crashed and needed a Reboot of the machine when i started the Ubuntu VM with the 3060 mounted.

So I am asking, is eGPU passthrough supported by Proxmox? Do i have to install additional drivers, or even blacklist some?

 

[leesteken]

So I am asking, is eGPU passthrough supported by Proxmox? Do i have to install additional drivers, or even blacklist some?

Passthrough is not fully guaranteed/supported but it often works. An eGPU is just a PCIe device, so it could work but Thunderbolt and hot-plug might complicate things.

My problem is, Proxmox completely crashed and needed a Reboot of the machine when i started the Ubuntu VM with the 3060 mounted.

Check your IOMMU groups. This is a sign that the GPU is in the same group as some devices essential for Proxmox. Search the forum about IOMMU groups and Thunderbolt, as I remember other people have experimented with this before.

 

[simon1994]

Wow, thank you for the fast reply. I did not work over the weekend but I will definately look into it.

 

[xoffio]

Hey simon1994, were you able to get the eGPU working with Proxmox ?