Windows Desktop v0.8.28 won't start on AMD GPU

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1

Hi folks,

First time user trying this out for some D&D ideas I had. Install seemed to go through without issue but I’m getting this message and log when I sttempted to start it? I’m running a 6900xt so is this just a matter that it won’t run on it?

[2026-04-09 14:52:52.890] [info] comfy-aimdo failed to load: Could not find module ‘C:\Users\user\Documents\ComfyUI.venv\Lib\site-packages\comfy_aimdo\aimdo.dll’ (or one of its dependencies). Try using the full path with constructor syntax.
NOTE: comfy-aimdo is currently only support for Nvidia GPUs

[2026-04-09 14:52:53.002] [info] Adding extra search path custom_nodes C:\Users\user\Documents\ComfyUI\custom_nodes
Adding extra search path download_model_base C:\Users\user\Documents\ComfyUI\models
Adding extra search path custom_nodes C:\Users\user\AppData\Local\Programs\ComfyUI\resources\ComfyUI\custom_nodes

[2026-04-09 14:52:53.003] [info] Setting output directory to: C:\Users\user\Documents\ComfyUI\output
Setting input directory to: C:\Users\user\Documents\ComfyUI\input
Setting user directory to: C:\Users\user\Documents\ComfyUI\user

[2026-04-09 14:52:53.883] [info] [START] Security scan
[DONE] Security scan
** ComfyUI startup time:
[2026-04-09 14:52:53.884] [info] 2026-04-09 14:52:53.884
** Platform: Windows
** Python version: 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]
** Python executable: C:\Users\user\Documents\ComfyUI.venv\Scripts\python.exe
** ComfyUI Path: C:\Users\user\AppData\Local\Programs\ComfyUI\resources\ComfyUI
** ComfyUI Base Folder Path: C:\Users\user\AppData\Local\Programs\ComfyUI\resources\ComfyUI
** User directory: C:\Users\user\Documents\ComfyUI\user
** ComfyUI-Manager config path: C:\Users\user\Documents\ComfyUI\user__manager\config.ini
** Log path: C:\Users\user\Documents\ComfyUI\user\comfyui.log

[2026-04-09 14:52:54.523] [info] [ComfyUI-Manager] Skipped fixing the ‘comfyui-frontend-package’ dependency because the ComfyUI is outdated.

[2026-04-09 14:52:54.524] [info] [PRE] ComfyUI-Manager

[2026-04-09 14:52:55.742] [error] Windows fatal exception: access violation

Stack (most recent call first):
File “C:\Users\user\Documents\ComfyUI.venv\Lib\site-packages\torch\cuda_init_.py”, line 182 in
[2026-04-09 14:52:55.743] [error] is_available
File “C:\Users\user\Documents\ComfyUI.venv\Lib\site-packages\comfy_kitchen\backends\cuda_init_.py”, line 639 in register
File "C:\Users\user\Documents\ComfyUI.venv\Lib\site-packages\comfy_kitchen\backends\cuda_init.py", line 650 in
File “”, line 488 in _call_with_frames_removed
File “”, line 999 in exec_module
File “”, line 935 in _load_unlocked
File “”, line 1331 in _find_and_load_unlocked
File “”, line 1360 in _find_and_load
File “”, line 488 in _call_with_frames_removed
File “”, line 1415 in handle_fromlist
File "C:\Users\user\Documents\ComfyUI.venv\Lib\site-packages\comfy_kitchen_init.py", line 3 in
File “”, line 488 in _call_with_frames_removed
File “”, line 999 in exec_module
File “”, line 935 in _load_unlocked
File “”, line 1331 in _find_and_load_unlocked
File “”, line 1360 in _find_and_load
File “C:\Users\user\AppData\Local\Programs\ComfyUI\resources\ComfyUI\comfy\quant_ops.py”, line 5 in
File “”, line 488 in _call_with_frames_removed
File “”, line 999 in exec_module
File “”, line 935 in _load_unlocked
File “”, line 1331 in _find_and_load_unlocked
File “”, line 1360 in _find_and_load
File “C:\Users\user\AppData\Local\Programs\ComfyUI\resources\ComfyUI\comfy\memory_management.py”, line 8 in
File “”, line 488 in _call_with_frames_removed
File “”, line 999 in exec_module
File “”, line 935 in _load_unlocked
File “”, line 1331 in _find_and_load_unlocked
File “”, line 1360 in _find_and_load
File “C:\Users\user\AppData\Local\Programs\ComfyUI\resources\ComfyUI\comfy\utils.py”, line 25 in
File “”, line 488 in _call_with_frames_removed
File “”, line 999 in exec_module
File “”, line 935 in _load_unlocked
File “”, line 1331 in _find_and_load_unlocked
File “”, line 1360 in _find_and_load
File “C:\Users\user\AppData\Local\Programs\ComfyUI\resources\ComfyUI\main.py”, line 194 in

2

hey, looking at your log there are two separate things going on, and only one of them matters.

the aimdo message is harmless. comfy-aimdo is an NVIDIA-only model offloading library. on AMD it just fails to load and moves on, that’s not your crash.

the real problem is the access violation in torch.cuda.is_available(). the Desktop app bundles a CUDA-only PyTorch, so when it tries to detect your GPU on an AMD-only system, it hits a native crash instead of a graceful fallback. your 6900 XT can definitely run ComfyUI, just not through the standard Desktop installer.

for an RX 6900 XT (RDNA2) on Windows, the best path right now is probably one of these community projects:

  1. ComfyUI-ZLUDA - well established, explicitly supports RDNA2. has a step-by-step install guide including HIP SDK setup.

  2. ComfyUI-ROCm (same author, newer) - uses AMD’s official TheRock PyTorch wheels. also supports RDNA2.

both need a recent Adrenalin driver. the AMD preview driver (labeled “PyTorch recommended” on AMD’s driver page) gives better stability from what I’ve seen.

once you’re set up, you can verify with: python -c "import torch; print(torch.cuda.is_available()); print(torch.cuda.get_device_name(0))" should return True and show your 6900 XT.

one heads-up: the official ComfyUI AMD portable build and AMD’s blog guides target RDNA3+ (RX 7000/9000). RDNA2 isn’t in their tested list, but the community projects above have solid RDNA2 support and a bunch of people are running 6800/6900 series cards with them.

3

Thank you for this, I will definitely check into your suggestions!