Can the Arc B580 12 GB run Stable Diffusion 1.5?
Yes. 16-bit fits on the Arc B580 12 GB with 8.7 GB to spare.
16-bit (2.1 GB) needs about 3.3 GB in use, so 8.7 GB of the 12 GB stays free: room for a larger image, a LoRA or a ControlNet.
01What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Checkpoint | v1-5-pruned-emaonly-fp16.safetensors 16-bit · Comfy-Org/stable-diffusion-v1-5-archive | models/checkpoints | 2.1 GB | Download → |
| Total download · keep about the same free on disk | 2.1 GB | |||
One file: the checkpoint already contains the text encoders and the VAE. Sizes from Hugging Face, 2026-10-01.
02Every SD 1.5 file on 12 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit ← SAFETENSORS · Comfy-Org | 2.1 GB | 3.3 GB | fits · 8.7 GB spare | the original weights | Hugging Face → |
“Needed” adds 0.8 GB of working memory for SD 1.5 and a 0.8 GB reserve. Sizes 2026-10-01. The 2.13 GB checkpoint also holds the text encoder and VAE; the UNet alone is about 1.7 GB at 16-bit.
03The text encoder
The text encoder is inside the checkpoint, so there is nothing extra to download.
04Measured and reported results
Nobody has sent measured numbers for this pair yet. If you run SD 1.5 on a Arc B580 12 GB, send your time per image and peak VRAM and it will appear here, credited.
05About 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 →
06Questions
How much VRAM does SD 1.5 need?
Around 3.3 GB with the smallest file (16-bit).
Which SD 1.5 file should I download for the Arc B580 12 GB?
16-bit (2.1 GB) from Comfy-Org/stable-diffusion-v1-5-archive.
How much do I need to download for SD 1.5 on the Arc B580 12 GB?
2.1 GB: v1-5-pruned-emaonly-fp16.safetensors.