Can the Arc B580 12 GB run Chroma1-HD?
Yes, but only just: FP8 leaves 0.5 GB free on the Arc B580 12 GB.
FP8 (9.2 GB) fits with only 0.5 GB to spare (about 11.5 GB of 12 GB).
01What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Model | Chroma1-HD-fp8mixed.safetensors FP8 · Comfy-Org/Chroma1-HD_repackaged | models/diffusion_models | 9.2 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 | 14.4 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 Chroma1-HD file on 12 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit SAFETENSORS · lodestones | 17.8 GB | 20.1 GB | 8.1 GB too big | the original weights | Hugging Face → |
| Q8_0 GGUF · silveroxides | 9.7 GB | 12.0 GB | spills 0.0 GB | practically identical to the original | Hugging Face → |
| FP8 ← SAFETENSORS · Comfy-Org | 9.2 GB | 11.5 GB | fits · 0.5 GB spare | practically identical to the original | Hugging Face → |
| Q6_K GGUF · silveroxides | 7.7 GB | 10.0 GB | fits · 2.0 GB spare | very close to the original | Hugging Face → |
| Q5_K_M GGUF · silveroxides | 6.7 GB | 9.0 GB | fits · 3.0 GB spare | close; small differences in fine detail | Hugging Face → |
| Q4_K_M GGUF · silveroxides | 5.6 GB | 7.9 GB | fits · 4.1 GB spare | good; some loss in fine detail and text | Hugging Face → |
| Q3_K_S GGUF · silveroxides | 4.3 GB | 6.6 GB | fits · 5.4 GB spare | noticeable loss of detail | Hugging Face → |
| Q2_K GGUF · silveroxides | 3.4 GB | 5.7 GB | fits · 6.3 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.
03Measured and reported results
Nobody has sent measured numbers for this pair yet. If you run Chroma1-HD on a Arc B580 12 GB, send your time per image and peak VRAM and it will appear here, credited.
04About the Arc B580 12 GB
Intel Arc GPUs run ComfyUI through PyTorch's native XPU support on Windows 11 and Linux. Memory works the same as on NVIDIA, so the fit verdicts apply. FP8 files save memory but give no speed-up, and some custom nodes are NVIDIA-only.
12 GB GDDR6 · 192-bit · 456 GB/s · Battlemage. Everything that runs on it →
05Questions
How much VRAM does Chroma1-HD need?
Around 5.7 GB with the smallest file (Q2_K) and 11.5 GB with an 8-bit file (FP8). The full 16-bit file needs about 20.1 GB.
Which Chroma1-HD file should I download for the Arc B580 12 GB?
FP8 (9.2 GB) from Comfy-Org/Chroma1-HD_repackaged.
FP8 or Q8_0 for Chroma1-HD on the Arc B580 12 GB?
Q8_0 (9.7 GB). The Arc B580 12 GB has no FP8 maths, so FP8 (9.2 GB) only saves memory and is a step further from the original.
How much do I need to download for Chroma1-HD on the Arc B580 12 GB?
14.4 GB: Chroma1-HD-fp8mixed.safetensors, t5xxl_fp8_e4m3fn.safetensors, ae.safetensors.