Can the RTX 3060 Ti 8 GB run HunyuanVideo 1.5?
Not entirely. Even Q4_K_M is 1.4 GB over 8 GB, so ComfyUI keeps part of it in system RAM.
Nothing fits entirely, but Q4_K_M (5.1 GB) overflows by only about 1.4 GB. ComfyUI keeps that part in system RAM automatically: slower than a full fit, but usable.
Also try the FP8 file (8.3 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 →
01With more VRAM
With 16 GB you could run HunyuanVideo 1.5 at 8-bit or better (Q8_0, 9.0 GB) with no offloading: for example on the RTX 5080 16 GB, RTX 5070 Ti 16 GB, RTX 5060 Ti 16 GB.
What changes from the RTX 3060 Ti 8 GB to the RTX 5060 Ti 16 GB →
02Every HunyuanVideo 1.5 file on 8 GB
| File | Size | Needed | On this card | Quality | Download |
|---|---|---|---|---|---|
| 16-bit SAFETENSORS · Comfy-Org | 16.7 GB | 21.0 GB | 13.0 GB too big | the original weights | Hugging Face → |
| Q8_0 GGUF · jayn7 | 9.0 GB | 13.3 GB | 5.3 GB too big | practically identical to the original | Hugging Face → |
| FP8 SAFETENSORS · Comfy-Org | 8.3 GB | 12.6 GB | 4.6 GB too big | practically identical to the original | Hugging Face → |
| Q6_K GGUF · jayn7 | 7.0 GB | 11.3 GB | 3.3 GB too big | very close to the original | Hugging Face → |
| Q5_K_M GGUF · jayn7 | 6.1 GB | 10.4 GB | 2.4 GB too big | close; small differences in fine detail | Hugging Face → |
| Q4_K_M ← GGUF · jayn7 | 5.1 GB | 9.4 GB | spills 1.4 GB | good; some loss in fine detail and text | Hugging Face → |
“Needed” adds 3.5 GB of working memory for HunyuanVideo 1.5 and a 0.8 GB reserve. Sizes 2026-10-01.
03What to download
| Part | File | Folder | Size | |
|---|---|---|---|---|
| Model | hunyuanvideo1.5_720p_t2v-Q4_K_M.gguf Q4_K_M · jayn7/HunyuanVideo-1.5_T2V_720p-GGUF | models/unet | 5.1 GB | Download → |
| Text encoder | qwen_2.5_vl_7b_fp8_scaled.safetensors Qwen2.5-VL 7B FP8 (scaled) · Comfy-Org/HunyuanVideo_1.5_repackaged | models/text_encoders | 9.4 GB | Download → |
| Text encoder | byt5_small_glyphxl_fp16.safetensors ByT5 small GlyphXL FP16 · Comfy-Org/HunyuanVideo_1.5_repackaged | models/text_encoders | 0.4 GB | Download → |
| VAE | hunyuanvideo15_vae_fp16.safetensors HunyuanVideo 1.5 VAE FP16 · Comfy-Org/HunyuanVideo_1.5_repackaged | models/vae | 2.5 GB | Download → |
| Total download · keep about the same free on disk | 17.4 GB | |||
Alternatives: Qwen2.5-VL 7B BF16 (16.6 GB). Only for some workflows: SigCLIP vision patch14 384 (0.9 GB, I2V only). Sizes from Hugging Face, 2026-10-01.
Free ComfyUI workflow, tested on my RTX 5060 Ti: 480p text to video, FP8 workflow (.json). Drag the file into ComfyUI. All workflows →
04The text encoder
At 9.4 GB even the smallest Qwen2.5-VL 7B + glyph encoder file is too big for 8 GB, so it runs from system RAM. That slows down reading the prompt, not the picture. Sizes: 16-bit 16.6 GB, FP8 9.4 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 HunyuanVideo 1.5 on a RTX 3060 Ti 8 GB, send your time per image and peak VRAM and it will appear here, credited.
06About the RTX 3060 Ti 8 GB
The RTX 3060 Ti 8 GB (Ampere) has no FP8 compute. FP8 files still load and save memory, but ComfyUI converts them back before the maths, so there is no speed gain - Q8_0 GGUF is the closer-to-original 8-bit choice. ComfyUI can compute INT8 files natively on NVIDIA, which is worth a try where a model offers one.
8 GB GDDR6 · 256-bit · 448 GB/s · Ampere. Everything that runs on it →
07Questions
How much VRAM does HunyuanVideo 1.5 need?
Around 9.4 GB with the smallest file (Q4_K_M) and 12.6 GB with an 8-bit file (FP8). The full 16-bit file needs about 21.0 GB.
Which HunyuanVideo 1.5 file should I download for the RTX 3060 Ti 8 GB?
Q4_K_M (5.1 GB) from jayn7/HunyuanVideo-1.5_T2V_720p-GGUF. Load it with Unet Loader (GGUF) from the ComfyUI-GGUF node pack.
FP8 or Q8_0 for HunyuanVideo 1.5 on the RTX 3060 Ti 8 GB?
Q8_0 (9.0 GB). The RTX 3060 Ti 8 GB has no FP8 maths, so FP8 (8.3 GB) only saves memory and is a step further from the original.
How much do I need to download for HunyuanVideo 1.5 on the RTX 3060 Ti 8 GB?
17.4 GB: hunyuanvideo1.5_720p_t2v-Q4_K_M.gguf, qwen_2.5_vl_7b_fp8_scaled.safetensors, byt5_small_glyphxl_fp16.safetensors, hunyuanvideo15_vae_fp16.safetensors.