Mac ComfyUI FP8 error fix: one extension gets video generation running on Apple Silicon
RestInPeaceAPIG · reddit · 2026-11-06
The author hit the "trying to convert Float8e4m3fn to the MPS backend" error when first generating videos with ComfyUI on a Mac — FP8 modules aren't supported by Apple Silicon's MPS backend. An older script-based fix from the community was too opaque for most users. The simple solution: install the ComfyUI-AppleSilicon-FP8 extension directly in Comfy Desktop, and everything runs smoothly afterward. A ready-to-copy fix for Mac users hitting the same error.
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