---
title: "FP8 (e4m3fn / e5m2) Precision — ComfyUI Glossary & Node Definition"
description: "8-bit floating point weight storage that halves checkpoint memory compared to FP16. Learn how FP8 (e4m3fn / e5m2) Precision works inside ComfyUI node workflows on Windows."
canonical: https://comfy.ink/words/fp8-e4m3fn
updated: 2026-10-17
---

# FP8 (e4m3fn / e5m2) Precision

8-bit floating point weight storage that halves checkpoint memory compared to FP16.

## Facts (2026-10-17)

- **Term:** FP8 (e4m3fn / e5m2) Precision
- **In Short:** 8-bit floating point weight storage that halves checkpoint memory compared to FP16.
- **Applies To:** ComfyUI SD 1.5, SDXL, Flux & Video

## Definition: FP8 (e4m3fn / e5m2) Precision

8-bit floating point weight storage that halves checkpoint memory compared to FP16.

RTX 40-series (Ada) and RTX 50-series (Blackwell) accelerate FP8 natively, while RTX 30-series cards use FP8 weight storage with fast FP16 compute.

## How to tune this in your ComfyUI workflow

Every parameter in ComfyUI is exposed directly on its node rather than hidden behind global settings tabs. You can inspect or override this behavior per pass in [ComfyUI Studio](https://comfy.ink/studio).

New to node graphs? Grab the Windows installer at [/download](https://comfy.ink/download) and open a built-in template from the workflow menu.

## FAQ

### What does FP8 (e4m3fn / e5m2) Precision do in ComfyUI?

8-bit floating point weight storage that halves checkpoint memory compared to FP16. RTX 40-series (Ada) and RTX 50-series (Blackwell) accelerate FP8 natively, while RTX 30-series cards use FP8 weight storage with fast FP16 compute.

### Where do I adjust this setting on the canvas?

Check the corresponding loader or [KSampler](https://comfy.ink/nodes/ksampler) widget in your active workflow graph.

## Related

- [ComfyUI Glossary](https://comfy.ink/words)
- [KSampler & KSampler (Advanced)](https://comfy.ink/nodes/ksampler)
- [ComfyUI Studio Workspace](https://comfy.ink/studio)
- [ComfyUI VRAM Requirements for SDXL, Flux & Video (6GB–24GB)](https://comfy.ink/guides/comfyui-vram-requirements-guide)
- [Latent Space & LATENT Pin](https://comfy.ink/words/latent-space)

## Download

Free desktop app: [Download Comfy](https://comfy.ink/download)

Markdown mirror: https://comfy.ink/words/fp8-e4m3fn.md