Chroma1-HD on 20 GB of VRAM
Yes. Q8_0 fits on 20 GB with 8.0 GB to spare. An 8.9B community model built from FLUX.1 schnell, Apache-2.0 licensed, with a big fine-tuning scene.
Runs well
Yes, with room to spare.
Q8_0 (9.7 GB) needs about 12.0 GB in use, so 8.0 GB of the 20 GB stays free: room for a larger image, a LoRA or a ControlNet.
Best fileQ8_0
File size9.7 GB
VRAM needed~12.0 GB
System RAM32 GB+
Memory map · 20 GB GPU12.0 GB / 20 GB
010 GB20 GB
Weights Q8_0 · 9.7 GBWorking memory · 1.5 GBReserve · 0.8 GBFree · 8.0 GB
calculated How this is counted.
Got an RTX 40 or 50? Swap Q8_0 for FP8 (9.2 GB): same quality class, computed natively there.
01What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Model | Chroma1-HD-Q8_0.gguf Q8_0 · silveroxides/Chroma1-HD-GGUF | models/unet | 9.7 GB | Download → |
| Text encoder | t5xxl_fp8_e4m3fn.safetensors T5-XXL FP8 · comfyanonymous/flux_text_encoders | models/text_encoders | 4.9 GB | Download → |
| VAE | ae.safetensors FLUX.1 VAE (ae) · lodestones/Chroma | models/vae | 0.3 GB | Download → |
| Total download · keep about the same free on disk | 15.0 GB | |||
Alternatives: T5-XXL FP16 (9.8 GB). Sizes from Hugging Face, 2026-10-01.
Free ComfyUI workflow, tested on my RTX 5060 Ti: FP8 workflow (.json). Drag the file into ComfyUI. All workflows →
02Every file, on 20 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit SAFETENSORS · lodestones | 17.8 GB | 20.1 GB | spills 0.1 GB | the original weights | Hugging Face → |
| Q8_0 ← GGUF · silveroxides | 9.7 GB | 12.0 GB | fits · 8.0 GB spare | practically identical to the original | Hugging Face → |
| FP8 SAFETENSORS · Comfy-Org | 9.2 GB | 11.5 GB | fits · 8.5 GB spare | practically identical to the original | Hugging Face → |
| Q6_K GGUF · silveroxides | 7.7 GB | 10.0 GB | fits · 10.0 GB spare | very close to the original | Hugging Face → |
| Q5_K_M GGUF · silveroxides | 6.7 GB | 9.0 GB | fits · 11.0 GB spare | close; small differences in fine detail | Hugging Face → |
| Q4_K_M GGUF · silveroxides | 5.6 GB | 7.9 GB | fits · 12.1 GB spare | good; some loss in fine detail and text | Hugging Face → |
| Q3_K_S GGUF · silveroxides | 4.3 GB | 6.6 GB | fits · 13.4 GB spare | noticeable loss of detail | Hugging Face → |
| Q2_K GGUF · silveroxides | 3.4 GB | 5.7 GB | fits · 14.3 GB spare | heavy loss; a last resort | Hugging Face → |
“Needed” adds 1.5 GB of working memory for Chroma1-HD and a 0.8 GB reserve. Sizes 2026-10-01.