Wan 2.1 T2V 14B on 20 GB of VRAM
Yes, but only just: FP8 leaves 1.4 GB free on 20 GB. Alibaba's 14B text-to-video model. Figures assume a short clip at 480p; higher resolution and more frames need more memory.
Runs well
Yes, just.
FP8 (14.3 GB) fits with only 1.4 GB to spare (about 18.6 GB of 20 GB).
Best fileFP8
File size14.3 GB
VRAM needed~18.6 GB
System RAM32 GB+
Memory map · 20 GB GPU18.6 GB / 20 GB
010 GB20 GB
Weights FP8 · 14.3 GBWorking memory · 3.5 GBReserve · 0.8 GBFree · 1.4 GB
calculated How this is counted.
Got an RTX 40 or 50? Swap Q8_0 for FP8 (14.3 GB): same quality class, computed natively there.
01What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Model | wan2.1_t2v_14B_fp8_e4m3fn.safetensors FP8 · Comfy-Org/Wan_2.1_ComfyUI_repackaged | models/diffusion_models | 14.3 GB | Download → |
| Text encoder | umt5_xxl_fp8_e4m3fn_scaled.safetensors UMT5-XXL FP8 (scaled) · Comfy-Org/Wan_2.1_ComfyUI_repackaged | models/text_encoders | 6.7 GB | Download → |
| VAE | wan_2.1_vae.safetensors Wan 2.1 VAE · Comfy-Org/Wan_2.1_ComfyUI_repackaged | models/vae | 0.3 GB | Download → |
| Total download · keep about the same free on disk | 21.3 GB | |||
Alternatives: UMT5-XXL FP16 (11.4 GB). Sizes from Hugging Face, 2026-10-01.
02Every file, on 20 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit SAFETENSORS · Comfy-Org | 28.6 GB | 32.9 GB | 12.9 GB too big | the original weights | Hugging Face → |
| Q8_0 GGUF · city96 | 15.9 GB | 20.2 GB | spills 0.2 GB | practically identical to the original | Hugging Face → |
| FP8 ← SAFETENSORS · Comfy-Org | 14.3 GB | 18.6 GB | fits · 1.4 GB spare | practically identical to the original | Hugging Face → |
| Q6_K GGUF · city96 | 12.5 GB | 16.8 GB | fits · 3.2 GB spare | very close to the original | Hugging Face → |
| Q5_K_M GGUF · city96 | 11.3 GB | 15.6 GB | fits · 4.4 GB spare | close; small differences in fine detail | Hugging Face → |
| Q4_K_M GGUF · city96 | 10.1 GB | 14.4 GB | fits · 5.6 GB spare | good; some loss in fine detail and text | Hugging Face → |
| Q3_K_M GGUF · city96 | 7.6 GB | 11.9 GB | fits · 8.1 GB spare | noticeable loss of detail | Hugging Face → |
“Needed” adds 3.5 GB of working memory for Wan 2.1 14B and a 0.8 GB reserve. Sizes 2026-10-01.