Can the RTX 4050 Laptop 6 GB run Wan 2.1 T2V 14B?
Not entirely. Even Q4_K_M is 8.4 GB over 6 GB, so ComfyUI keeps part of it in system RAM.
The smallest sensible file, Q4_K_M (10.1 GB), needs about 14.4 GB - 8.4 GB more than RTX 4050 Laptop 6 GB has. ComfyUI can still run it by streaming part of the model from system RAM. How much slower that is depends on your ComfyUI version, the file format and the PCIe link - see the note below.
Also try the FP8 file (14.3 GB) on this GPU. It does not fit entirely, but a current ComfyUI streams the overflow from RAM and native 8-bit files often beat a small GGUF that does fit. Dynamic VRAM →
Using Kijai's WanVideoWrapper instead of the native nodes? Its WanVideo BlockSwap node keeps part of the model in system RAM. To run the FP8 file (14.3 GB) on RTX 4050 Laptop 6 GB, start with blocks_to_swap ≈ 37 (of 40). Each block is about 0.4 GB; raise the number if you still run out of memory, lower it for speed. estimate WanVideoWrapper →
01With more VRAM
With 20 GB you could run Wan 2.1 14B at 8-bit or better (FP8, 14.3 GB) with no offloading.
02Every Wan 2.1 14B file on 6 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit SAFETENSORS · Comfy-Org | 28.6 GB | 32.9 GB | 26.9 GB too big | the original weights | Hugging Face → |
| FP8 SAFETENSORS · Comfy-Org | 14.3 GB | 18.6 GB | 12.6 GB too big | practically identical to the original | Hugging Face → |
| Q8_0 GGUF · city96 | 15.9 GB | 20.2 GB | 14.2 GB too big | practically identical to the original | Hugging Face → |
| Q6_K GGUF · city96 | 12.5 GB | 16.8 GB | 10.8 GB too big | very close to the original | Hugging Face → |
| Q5_K_M GGUF · city96 | 11.3 GB | 15.6 GB | 9.6 GB too big | close; small differences in fine detail | Hugging Face → |
| Q4_K_M ← GGUF · city96 | 10.1 GB | 14.4 GB | 8.4 GB too big | good; some loss in fine detail and text | Hugging Face → |
| Q3_K_M GGUF · city96 | 7.6 GB | 11.9 GB | 5.9 GB too big | 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.
03What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Model | wan2.1-t2v-14b-Q4_K_M.gguf Q4_K_M · city96/Wan2.1-T2V-14B-gguf | models/unet | 10.1 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 | 17.1 GB | |||
Alternatives: UMT5-XXL FP16 (11.4 GB). Sizes from Hugging Face, 2026-10-01.
04The text encoder
Take the smallest UMT5-XXL file (3.7 GB): it is the only one that fits in 6 GB on its own. Sizes: 16-bit 11.4 GB, FP8 6.7 GB, GGUF Q4_K_M 3.7 GB. Why the encoder does not count against VRAM →
05Measured and reported results
Nobody has sent measured numbers for this pair yet. If you run Wan 2.1 14B on a RTX 4050 Laptop 6 GB, send your time per image and peak VRAM and it will appear here, credited.
06About the RTX 4050 Laptop 6 GB
The RTX 4050 Laptop 6 GB is an Ada Lovelace GPU with hardware FP8, so ComfyUI can compute Comfy-Org's FP8 files natively: small and fast. (Plain FP8 files use FP8 maths with the --fast fp8_matrix_mult option.) As a laptop GPU it runs at a lower power limit than desktop cards (35–115 W depending on the laptop). The memory verdicts are the same; speed depends heavily on how much power the laptop maker allows.
6 GB GDDR6 · 96-bit · Ada Lovelace · 35–115 W. Everything that runs on it →
07Questions
How much VRAM does Wan 2.1 14B need?
Around 11.9 GB with the smallest file (Q3_K_M) and 18.6 GB with an 8-bit file (FP8). The full 16-bit file needs about 32.9 GB.
Which Wan 2.1 14B file should I download for the RTX 4050 Laptop 6 GB?
Q4_K_M (10.1 GB) from city96/Wan2.1-T2V-14B-gguf. Load it with Unet Loader (GGUF) from the ComfyUI-GGUF node pack.
FP8 or Q8_0 for Wan 2.1 14B on the RTX 4050 Laptop 6 GB?
FP8 (14.3 GB): the RTX 4050 Laptop 6 GB computes it natively, while Q8_0 (15.9 GB) is unpacked on the fly.
How much do I need to download for Wan 2.1 14B on the RTX 4050 Laptop 6 GB?
17.1 GB: wan2.1-t2v-14b-Q4_K_M.gguf, umt5_xxl_fp8_e4m3fn_scaled.safetensors, wan_2.1_vae.safetensors.