Can the RX 7900 XTX 24 GB run Wan 2.1 I2V 14B 480P?
Yes, but only just: Q8_0 leaves 1.6 GB free on the RX 7900 XTX 24 GB.
Q8_0 (18.1 GB) fits with only 1.6 GB to spare (about 22.4 GB of 24 GB).
01What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Model | wan2.1-i2v-14b-480p-Q8_0.gguf Q8_0 · city96/Wan2.1-I2V-14B-480P-gguf | models/unet | 18.1 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 → |
| Also needed | clip_vision_h.safetensors CLIP Vision H · Comfy-Org/Wan_2.1_ComfyUI_repackaged | models/clip_vision | 1.3 GB | Download → |
| Total download · keep about the same free on disk | 26.4 GB | |||
Alternatives: UMT5-XXL FP16 (11.4 GB). Sizes from Hugging Face, 2026-10-01.
System RAM: 48 GB or more. These files take about 26.4 GB of RAM while loaded, 32.4 GB with Windows and ComfyUI. What happens with less. calculated
02Every Wan 2.1 I2V 480P file on 24 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit SAFETENSORS · Comfy-Org | 32.8 GB | 37.1 GB | 13.1 GB too big | the original weights | Hugging Face → |
| Q8_0 ← GGUF · city96 | 18.1 GB | 22.4 GB | fits · 1.6 GB spare | practically identical to the original | Hugging Face → |
| FP8 SAFETENSORS · Comfy-Org | 16.4 GB | 20.7 GB | fits · 3.3 GB spare | practically identical to the original | Hugging Face → |
| Q6_K GGUF · city96 | 14.2 GB | 18.5 GB | fits · 5.5 GB spare | very close to the original | Hugging Face → |
| Q5_K_M GGUF · city96 | 12.7 GB | 17.0 GB | fits · 7.0 GB spare | close; small differences in fine detail | Hugging Face → |
| Q4_K_M GGUF · city96 | 11.3 GB | 15.6 GB | fits · 8.4 GB spare | good; some loss in fine detail and text | Hugging Face → |
| Q3_K_M GGUF · city96 | 8.6 GB | 12.9 GB | fits · 11.1 GB spare | noticeable loss of detail | Hugging Face → |
“Needed” adds 3.5 GB of working memory for Wan 2.1 I2V 480P and a 0.8 GB reserve. Sizes 2026-10-01.
03Measured and reported results
| Label | Setup | Result | Peak VRAM | Date | Source |
|---|---|---|---|---|---|
| reported | wan2.1_i2v_480p_14B_fp8_scaled · 480x704 · 25 steps “Wan2.1 i2v | 480×704 | 81 | 25 | ~40 min” Windows 11, native ROCm 7.1, PYTORCH_NO_HIP_MEMORY_CACHING=1; approximate (~40 min = 2400 s); author notes slow vs CUDA | 2400 s / clip (81 frames) | — | 2026-04-05 | joshwaamein.github.io → |
Other people's numbers are copied as published, with a link. Send yours.
04About the RX 7900 XTX 24 GB
ComfyUI supports AMD GPUs on Windows officially since v0.7.0 (January 2026), through ROCm. Memory works the same as on NVIDIA, so the fit verdicts apply. Some custom nodes are NVIDIA-only. RDNA 3 has no FP8 compute, so FP8 files save memory but give no speed-up.
24 GB GDDR6 · 384-bit · 960 GB/s · RDNA 3. Everything that runs on it →
05Questions
How much VRAM does Wan 2.1 I2V 480P need?
Around 12.9 GB with the smallest file (Q3_K_M) and 20.7 GB with an 8-bit file (FP8). The full 16-bit file needs about 37.1 GB.
Which Wan 2.1 I2V 480P file should I download for the RX 7900 XTX 24 GB?
Q8_0 (18.1 GB) from city96/Wan2.1-I2V-14B-480P-gguf. Load it with Unet Loader (GGUF) from the ComfyUI-GGUF node pack.
FP8 or Q8_0 for Wan 2.1 I2V 480P on the RX 7900 XTX 24 GB?
Q8_0 (18.1 GB). The RX 7900 XTX 24 GB has no FP8 maths, so FP8 (16.4 GB) only saves memory and is a step further from the original.
How much do I need to download for Wan 2.1 I2V 480P on the RX 7900 XTX 24 GB?
26.4 GB: wan2.1-i2v-14b-480p-Q8_0.gguf, umt5_xxl_fp8_e4m3fn_scaled.safetensors, wan_2.1_vae.safetensors, clip_vision_h.safetensors.