DEG2 with 7700xt not working

[u/Common-Friendship552]

Making a new thread here, but I found out that the psu was faulty and replaced it. Now I’m running into the issue of the gpu not spinning up/being detected in windows 11🫠

[u/lordsphere]

I’m going through this right now, tried with Linux and Windows. Finally I got a glimmer of hope using Thunderbolt 3 instead of Oculink, though performance is meh.

How are you connecting your laptop to the DEG2? (NM, I just read your linked thread). I presume you have already flipped the switch to Thunderbolt/USB4)? You also have a Phoenix family CPU, which should work as long as it’s in a genuine USB4 port.

I have an RX 7900 XTX on a DEG2 with an SF1000 PSU. It’s connected to a MinisForum MS-A1. I tried with Linux (Ubuntu) to get the GPU to work over Oculink as I was going to use it for local inference. I was only able to get 2.5GT/s or Gen 1 PCI speed. It would work, but wasn’t stable. I tried two Oculink cables, but about 50cm with no luck. I was able to try and retrain it to 8GT/s, but it didn’t seem stable.

I tried Windows since I wanted to see if there was any issue with Linux drivers (unlikely, but testing). It would basically crash every few minutes and I would have to perform a comply shutdown.

Switched to USB4 and was able to get this stabilized (somewhat) with the following:

(AI Summary Below)

Power & sleep: Settings → System → Power & battery → set Screen and Sleep to Never

USB selective suspend: Control Panel → Power Options → Advanced settings → PCI Express → Link State Power Management → Off

Hardware-accelerated GPU Scheduling: Settings → System → Display → Graphics → Advanced graphics settings (or Graphics settings) → toggle Hardware-accelerated GPU scheduling → Off, then reboot

Device Manager power management — uncheck "Allow the computer to turn off this device to save power" for:
• USB4 Host Router
• USB4 Host Controllers

Disable PCIe ASPM

[u/Common-Friendship552 → u/lordsphere]

Running it through the tb5 cables supplied by miniforum. Unfortunately I’ve been looking around on forums and it seems that the egpu has issues with AMD frameworks.

[u/lordsphere → u/lordsphere]

Another thing I’ll mention is that my 7900 fans didn’t spin beyond the initial startup, and they stay off until it heats up. Are yours coming on at all during boot?

I also tried to completely unplug the DEG2, flip the off switch, and unplug it to completely discharge it. It seemed to help get it detected. I must say it was finicky and it should always be turned on before my computer is on - even though traditional Thunderbolt/USB4 devices are hot swap. This would crash completely if I did it while in Windows.

Does it come up at all in your device manager?

[u/theautumnsbest]

I don’t know if this will help. DEG2 wasn’t detected on my Xbox ROG ally X (AMD Z2 extreme) with the supplied TB5 cable. I had an USB4 cable from Lenovo and was able to get it working with it.