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docs: add FP8 format explanation to startup-flags page #1292

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docs: add FP8 format explanation to startup-flags page #1292

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4 changes: 4 additions & 0 deletions development/comfyui-server/startup-flags.mdx
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Expand Up @@ -106,6 +106,10 @@ python main.py --disable-auto-launch
| `--fp8_e5m2-unet` | Store UNet weights in fp8 (e5m2). |
| `--fp8_e8m0fnu-unet` | Store UNet weights in fp8 (e8m0fnu). |

<Tip>
**FP8 format differences**: `e4m3fn` (4 exponent bits, 3 mantissa bits) balances precision and dynamic range, making it the most commonly used FP8 format for model loading. `e5m2` (5 exponent, 2 mantissa) favors wider range at the cost of precision. `e8m0fnu` (8 exponent, 0 mantissa) maximizes dynamic range but is not supported on all hardware.
</Tip>

### VAE precision

| Flag | Description |
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