LTX-Video 13B (0.9.8) on 20 GB of VRAM
Yes, but only just: Q8_0 leaves 1.7 GB free on 20 GB. The last of the pre-LTX-2 video models from Lightricks (July 2025). No audio, T5 text encoder, and much lighter than LTX-2.
Runs well
Yes, just.
Q8_0 (14.0 GB) fits with only 1.7 GB to spare (about 18.3 GB of 20 GB).
Best fileQ8_0
File size14.0 GB
VRAM needed~18.3 GB
System RAM32 GB+
Memory map · 20 GB GPU18.3 GB / 20 GB
010 GB20 GB
Weights Q8_0 · 14.0 GBWorking memory · 3.5 GBReserve · 0.8 GBFree · 1.7 GB
calculated How this is counted.
Got an RTX 40 or 50? Swap Q8_0 for FP8 (15.7 GB): same quality class, computed natively there.
01What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Model | LTXV-13B-0.9.8-dev-Q8_0.gguf Q8_0 · QuantStack/LTXV-13B-0.9.8-dev-GGUF | models/unet | 14.0 GB | Download → |
| Text encoder | t5xxl_fp8_e4m3fn_scaled.safetensors T5-XXL FP8 (scaled) · comfyanonymous/flux_text_encoders | models/text_encoders | 5.2 GB | Download → |
| VAE | LTXV-13B-0.9.8-dev-VAE.safetensors LTXV 13B 0.9.8 VAE (standalone, QuantStack) · QuantStack/LTXV-13B-0.9.8-dev-GGUF | models/vae | 2.5 GB | Download → |
| Total download · keep about the same free on disk | 21.7 GB | |||
Alternatives: T5-XXL FP16 (9.8 GB). Sizes from Hugging Face, 2026-10-01.
02Every file, on 20 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit SAFETENSORS · Lightricks | 28.6 GB | 32.9 GB | 12.9 GB too big | the original weights | Hugging Face → |
| Q8_0 ← GGUF · QuantStack | 14.0 GB | 18.3 GB | fits · 1.7 GB spare | practically identical to the original | Hugging Face → |
| FP8 SAFETENSORS · Lightricks | 15.7 GB | 20.0 GB | fits · 0.0 GB spare | practically identical to the original | Hugging Face → |
| Q6_K GGUF · QuantStack | 10.9 GB | 15.2 GB | fits · 4.8 GB spare | very close to the original | Hugging Face → |
| Q5_K_M GGUF · QuantStack | 9.8 GB | 14.1 GB | fits · 5.9 GB spare | close; small differences in fine detail | Hugging Face → |
| Q4_K_M GGUF · QuantStack | 8.8 GB | 13.1 GB | fits · 6.9 GB spare | good; some loss in fine detail and text | Hugging Face → |
| Q3_K_M GGUF · QuantStack | 6.5 GB | 10.8 GB | fits · 9.2 GB spare | noticeable loss of detail | Hugging Face → |
| Q2_K GGUF · QuantStack | 4.7 GB | 9.0 GB | fits · 11.0 GB spare | heavy loss; a last resort | Hugging Face → |
“Needed” adds 3.5 GB of working memory for LTX-Video 13B and a 0.8 GB reserve. Sizes 2026-10-01.