HiDream-I1 (Dev) on 24 GB of VRAM
Yes, but only just: Q8_0 leaves 2.5 GB free on 24 GB. A 17B mixture-of-experts image model with four text encoders. The Full version has the same file sizes but uses more steps.
Runs well
Yes.
Take Q8_0 (18.7 GB). In use it comes to about 21.5 GB, with 2.5 GB left over on 24 GB.
Best fileQ8_0
File size18.7 GB
VRAM needed~21.5 GB
System RAM48 GB+
Memory map · 24 GB GPU21.5 GB / 24 GB
012 GB24 GB
Weights Q8_0 · 18.7 GBWorking memory · 2.0 GBReserve · 0.8 GBFree · 2.5 GB
calculated How this is counted.
Got an RTX 40 or 50? Swap Q8_0 for FP8 (17.1 GB): same quality class, computed natively there.
01What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Model | hidream-i1-dev-Q8_0.gguf Q8_0 · city96/HiDream-I1-Dev-gguf | models/unet | 18.7 GB | Download → |
| Text encoder | t5xxl_fp8_e4m3fn_scaled.safetensors T5-XXL FP8 scaled · Comfy-Org/HiDream-I1_ComfyUI | models/text_encoders | 5.2 GB | Download → |
| Text encoder | clip_l_hidream.safetensors CLIP-L (HiDream) · Comfy-Org/HiDream-I1_ComfyUI | models/text_encoders | 0.2 GB | Download → |
| Text encoder | clip_g_hidream.safetensors CLIP-G (HiDream) · Comfy-Org/HiDream-I1_ComfyUI | models/text_encoders | 1.4 GB | Download → |
| Text encoder | llama_3.1_8b_instruct_fp8_scaled.safetensors Llama 3.1 8B Instruct FP8 · Comfy-Org/HiDream-I1_ComfyUI | models/text_encoders | 9.1 GB | Download → |
| VAE | ae.safetensors FLUX.1 VAE (ae) · Comfy-Org/HiDream-I1_ComfyUI | models/vae | 0.3 GB | Download → |
| Total download · keep about the same free on disk | 34.9 GB | |||
Alternatives: T5-XXL FP16 (9.8 GB). Sizes from Hugging Face, 2026-10-01.
System RAM: 48 GB or more. These files take about 34.9 GB of RAM while loaded, 40.9 GB with Windows and ComfyUI. What happens with less. calculated
02Every file, on 24 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit SAFETENSORS · Comfy-Org | 34.2 GB | 37.0 GB | 13.0 GB too big | the original weights | Hugging Face → |
| Q8_0 ← GGUF · city96 | 18.7 GB | 21.5 GB | fits · 2.5 GB spare | practically identical to the original | Hugging Face → |
| FP8 SAFETENSORS · Comfy-Org | 17.1 GB | 19.9 GB | fits · 4.1 GB spare | practically identical to the original | Hugging Face → |
| Q6_K GGUF · city96 | 14.7 GB | 17.5 GB | fits · 6.5 GB spare | very close to the original | Hugging Face → |
| Q5_K_M GGUF · city96 | 13.0 GB | 15.8 GB | fits · 8.2 GB spare | close; small differences in fine detail | Hugging Face → |
| Q4_K_M GGUF · city96 | 11.5 GB | 14.3 GB | fits · 9.7 GB spare | good; some loss in fine detail and text | Hugging Face → |
| Q3_K_M GGUF · city96 | 8.8 GB | 11.6 GB | fits · 12.4 GB spare | noticeable loss of detail | Hugging Face → |
| Q2_K GGUF · city96 | 6.6 GB | 9.4 GB | fits · 14.6 GB spare | heavy loss; a last resort | Hugging Face → |
“Needed” adds 2 GB of working memory for HiDream-I1 and a 0.8 GB reserve. Sizes 2026-10-01.