Hello everyone,

I am facing a strange issue after upgrading my eGPU setup and would appreciate any technical insight.

My setup

• Laptop: 2024 16" Xiaomi RedmiBook 16 — Intel Core i5-13500H
• eGPU Dock: TH3P4G3 V4
• GPU: Radeon RX 9070
• PSU: Deepcool PQ850G 
• OS: Clean install of Windows 11 

The problem

Previously, I used a Radeon RX 6700 XT with this exact same dock and cable and it worked perfectly. Afterwards, I switched to a PC and the video card migrated to it. Afterwards, I upgraded the video card to a 9070, and now the situation again forces me to use an external video card.

After swapping to the new Radeon RX 9070, the eGPU dock refuses to initialize. Upon plugging the Thunderbolt cable into the laptop, the main LED on the TH3P4G3 V4 stays solid blue (Standby mode). The PSU does not click, the GPU fans do not spin, and the power LEDs around 8-pins on the RX 9070 itself remain completely dead. Windows Device Manager shows absolutely no hardware changes.

Important clues

The "Smartphone test": If I plug a smartphone into the main thunderbolt port of the dock and laptop into the second port, the TH3P4G3 V4 instantly clicks, turns Green, the PSU fires up, but GPU is still not detected.

The "Data Port" behavior: If I plug the laptop into the Data-Only port of the dock, the local port LED turns Green, but the GPU is not detected.

What I have already tried (None of this fixed the issue):

Clean Windows install: Reinstalled Windows 11 to wipe any driver conflicts.

DDU clean: Completely wiped all AMD drivers in Safe Mode(before reinstalling Windows).

PSU paperclip trick: If I bridge pins 4 and 5 (PS-ON to GND) on the 24-pin motherboard cable, the PSU forces the dock powered on and switch turns Green. However, even in this state, plugging the cable into the laptop results in complete silence - no Windows connection sound, no new devices in Device Manager.

Questions

1. Has anyone encountered this specific behavior with RDNA 4 cards on Intel 13th-gen?
2. Are there any known firmware compatibility issues between the TH3P4G3 V4?

Thank you in advance!

This topic was modified 6 hours ago

(@morgwai)

Honorable Member

Joined: 2 years ago

(@morgwai)

Honorable Member

Joined: 2 years ago

@aukin_gleb, most probably it's the RedmiBook's UEFI firmware: probably some firmware update either broke PCIe tunneling completely or reset some settings. Review all UEFI settings and if nothing helps try downgrading the firmware.

A hardware failure of some component of the RedmiBook related to PCIe tunneling is also possible, but less likely.

This post was modified 15 hours ago