FLUX.1 Fill [dev] on 6 GB of VRAM
Not entirely. Even Q3_K_S is 1.8 GB over 6 GB, so ComfyUI keeps part of it in system RAM. The inpainting and outpainting model from the FLUX.1 Tools release. Same 12B size class as FLUX.1 dev.
Offload
Not entirely in VRAM, but it can still run.
Nothing fits entirely, but Q3_K_S (5.2 GB) overflows by only about 1.8 GB. ComfyUI keeps that part in system RAM automatically: slower than a full fit, but usable.
Best fileQ3_K_S
File size5.2 GB
VRAM needed~7.8 GB
System RAM32 GB+
Memory map · 6 GB GPU7.8 GB needed · 1.8 GB over 6 GB
04 GB8 GB
Weights Q3_K_S · 5.2 GBWorking memory · 1.8 GBReserve · 0.8 GBSpills to system RAM · 1.8 GB
calculated How this is counted.
01Other amounts of VRAM
02Every file, on 6 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit SAFETENSORS · black-forest-labs | 23.8 GB | 26.4 GB | 20.4 GB too big | the original weights | Hugging Face → |
| Q8_0 GGUF · YarvixPA | 12.7 GB | 15.3 GB | 9.3 GB too big | practically identical to the original | Hugging Face → |
| Q6_K GGUF · YarvixPA | 9.9 GB | 12.5 GB | 6.5 GB too big | very close to the original | Hugging Face → |
| Q5_K_S GGUF · YarvixPA | 8.3 GB | 10.9 GB | 4.9 GB too big | close; small differences in fine detail | Hugging Face → |
| Q4_K_S GGUF · YarvixPA | 6.8 GB | 9.4 GB | 3.4 GB too big | good; some loss in fine detail and text | Hugging Face → |
| Q3_K_S ← GGUF · YarvixPA | 5.2 GB | 7.8 GB | spills 1.8 GB | noticeable loss of detail | Hugging Face → |
“Needed” adds 1.8 GB of working memory for FLUX.1 Fill and a 0.8 GB reserve. Sizes 2026-10-01.
03What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Model | flux1-fill-dev-Q3_K_S.gguf Q3_K_S · YarvixPA/FLUX.1-Fill-dev-GGUF | models/unet | 5.2 GB | Download → |
| Text encoder | t5xxl_fp8_e4m3fn.safetensors T5-XXL FP8 · comfyanonymous/flux_text_encoders | models/text_encoders | 4.9 GB | Download → |
| Text encoder | clip_l.safetensors CLIP-L · comfyanonymous/flux_text_encoders | models/text_encoders | 0.2 GB | Download → |
| VAE | ae.safetensors FLUX.1 VAE (ae) · Comfy-Org/Lumina_Image_2.0_Repackaged | models/vae | 0.3 GB | Download → |
| Total download · keep about the same free on disk | 10.7 GB | |||
Alternatives: T5-XXL FP16 (9.8 GB). Sizes from Hugging Face, 2026-10-01.