Windows 11 ComfyUI user gets Sage Attention and FlashAttention 2 running on RTX 5090 FE
Left_of_Laniakea · reddit · 2026-07-27
A Reddit user shared a working setup for getting Sage Attention and FlashAttention 2 running on a Windows 11 ComfyUI install with an RTX 5090 FE.
Key details from the post:
- OS: Windows 11
- CUDA: 13.2
- Torch: 2.12.1
- Python: 3.12
- FlashAttention: v2.9.1
- ComfyUI: v0.28.0-40
- GPU: RTX 5090 FE
- KJ patch nodes were used for attention
The author says Sage Attention installed cleanly and appears faster so far, and points to a Hugging Face package for FlashAttention 2 on Windows as the solution that finally worked.
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