Chroma1-HD on 6 GB of VRAM
Not at full quality. The 16-bit and 8-bit files are too big for 6 GB; the largest that fits is Q2_K (3.4 GB). An 8.9B community model built from FLUX.1 schnell, Apache-2.0 licensed, with a big fine-tuning scene.
Q2_K (3.4 GB) fits with only 0.3 GB to spare (about 5.7 GB of 6 GB). Quality: heavy loss; a last resort. For better quality, Q3_K_S (4.3 GB) also runs, with about 0.6 GB spilling into system RAM - a little slower, still practical.
Also try the FP8 file (9.2 GB) on NVIDIA GPUs. It does not fit entirely, but a current ComfyUI streams the overflow from RAM and native 8-bit files often beat a small GGUF that does fit. Dynamic VRAM →
01Other amounts of VRAM
02Every file, on 6 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit SAFETENSORS · lodestones | 17.8 GB | 20.1 GB | 14.1 GB too big | the original weights | Hugging Face → |
| Q8_0 GGUF · silveroxides | 9.7 GB | 12.0 GB | 6.0 GB too big | practically identical to the original | Hugging Face → |
| FP8 SAFETENSORS · Comfy-Org | 9.2 GB | 11.5 GB | 5.5 GB too big | practically identical to the original | Hugging Face → |
| Q6_K GGUF · silveroxides | 7.7 GB | 10.0 GB | 4.0 GB too big | very close to the original | Hugging Face → |
| Q5_K_M GGUF · silveroxides | 6.7 GB | 9.0 GB | 3.0 GB too big | close; small differences in fine detail | Hugging Face → |
| Q4_K_M GGUF · silveroxides | 5.6 GB | 7.9 GB | spills 1.9 GB | good; some loss in fine detail and text | Hugging Face → |
| Q3_K_S GGUF · silveroxides | 4.3 GB | 6.6 GB | spills 0.6 GB | noticeable loss of detail | Hugging Face → |
| Q2_K ← GGUF · silveroxides | 3.4 GB | 5.7 GB | fits · 0.3 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.
03What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Model | Chroma1-HD-Q2_K.gguf Q2_K · silveroxides/Chroma1-HD-GGUF | models/unet | 3.4 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 | 8.6 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 →