Can the RTX 4090 24 GB run Wan 2.2 I2V A14B?
Yes. FP8 fits on the RTX 4090 24 GB with 5.4 GB to spare.
Take FP8 (14.3 GB). In use it comes to about 18.6 GB, with 5.4 GB left over on 24 GB.
01What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Model | wan2.2_i2v_high_noise_14B_fp8_scaled.safetensors high-noise model (early steps) FP8 · Comfy-Org/Wan_2.2_ComfyUI_Repackaged | models/diffusion_models | 14.3 GB | Download → |
| Model | wan2.2_i2v_low_noise_14B_fp8_scaled.safetensors low-noise model (late steps) FP8 · Comfy-Org/Wan_2.2_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_2.2_ComfyUI_Repackaged | models/vae | 0.3 GB | Download → |
| Total download · keep about the same free on disk | 35.6 GB | |||
Alternatives: UMT5-XXL FP16 (11.4 GB). Sizes from Hugging Face, 2026-10-01.
System RAM: 48 GB or more. These files (both noise models) take about 35.6 GB of RAM while loaded, 41.6 GB with Windows and ComfyUI. What happens with less. calculated
02Every Wan 2.2 I2V file on 24 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit SAFETENSORS · Comfy-Org | 28.6 GB | 32.9 GB | 8.9 GB too big | the original weights | Hugging Face → |
| FP8 ← SAFETENSORS · Comfy-Org | 14.3 GB | 18.6 GB | fits · 5.4 GB spare | practically identical to the original | Hugging Face → |
| Q8_0 GGUF · QuantStack | 15.4 GB | 19.7 GB | fits · 4.3 GB spare | practically identical to the original | Hugging Face → |
| Q6_K GGUF · QuantStack | 12.0 GB | 16.3 GB | fits · 7.7 GB spare | very close to the original | Hugging Face → |
| Q5_K_M GGUF · QuantStack | 10.8 GB | 15.1 GB | fits · 8.9 GB spare | close; small differences in fine detail | Hugging Face → |
| Q4_K_M GGUF · QuantStack | 9.7 GB | 14.0 GB | fits · 10.0 GB spare | good; some loss in fine detail and text | Hugging Face → |
| Q3_K_M GGUF · QuantStack | 7.2 GB | 11.5 GB | fits · 12.5 GB spare | noticeable loss of detail | Hugging Face → |
| Q2_K GGUF · QuantStack | 5.3 GB | 9.6 GB | fits · 14.4 GB spare | heavy loss; a last resort | Hugging Face → |
“Needed” adds 3.5 GB of working memory for Wan 2.2 I2V and a 0.8 GB reserve. Sizes 2026-10-01. Wan 2.2 A14B uses two files of this size (high-noise and low-noise); only one sits in VRAM at a time, both must fit in system RAM.
03Measured and reported results
| Label | Setup | Result | Peak VRAM | Date | Source |
|---|---|---|---|---|---|
| reported | Wan2.2-I2V-A14B High/Low Q6_K GGUF · 800x448 · 8 steps “RTX 4090なら1分半ほど、RTX 5080はほぼ2分で480p解像度を5秒出力できます。” Chimolog GPU review; ComfyUI 0.3.5x, Kijai-based workflow, 2+2+4 steps with Lightx2v/Lightning LoRAs; '1分半ほど' = about 1.5 min (converted to 90 s, approximate); exact values only in | 90 s / clip (81 frames) | — | 2025-08-28 | chimolog.co → |
Other people's numbers are copied as published, with a link. Send yours.
04About the RTX 4090 24 GB
The RTX 4090 24 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.)
24 GB GDDR6X · 384-bit · 1008 GB/s · Ada Lovelace. Everything that runs on it →
05Questions
How much VRAM does Wan 2.2 I2V need?
Around 9.6 GB with the smallest file (Q2_K) and 18.6 GB with an 8-bit file (FP8). The full 16-bit file needs about 32.9 GB.
Which Wan 2.2 I2V file should I download for the RTX 4090 24 GB?
FP8 (14.3 GB) from Comfy-Org/Wan_2.2_ComfyUI_Repackaged.
FP8 or Q8_0 for Wan 2.2 I2V on the RTX 4090 24 GB?
FP8 (14.3 GB): the RTX 4090 24 GB computes it natively, while Q8_0 (15.4 GB) is unpacked on the fly.
How much do I need to download for Wan 2.2 I2V on the RTX 4090 24 GB?
35.6 GB: wan2.2_i2v_high_noise_14B_fp8_scaled.safetensors, wan2.2_i2v_low_noise_14B_fp8_scaled.safetensors, umt5_xxl_fp8_e4m3fn_scaled.safetensors, wan_2.1_vae.safetensors.