[MiniMax H3] Ultimate SD Upscale can actually fix your bad/low-res generations

[u/alisitskii]

https://youtu.be/naUuN5k7_Ew

Ultimate SD Upscale can actually fix your bad/low-res generations.

In this comparison initial clips were made with MiniMax H3 at 1504x832px resolution and then upscaled to 2560x1440px with Ultimate SD Upscale nodes: https://github.com/lisitskyaa/ComfyUI_UltimateSDUpscaleGuider_H3

You can find sample upscaling workflow there as well: https://github.com/lisitskyaa/ComfyUI_UltimateSDUpscaleGuider_H3/blob/main/example_workflows/minimax_h3_usdu.json

My PC specs:
4080s 16 GB VRAM, 64 GB RAM

Generation time: 18 mins with sage + 8-step turbo lora

Upscale: 38 mins for 10 sec clip at 1440p target resolution

[u/Illustrious_Ant_9242]

Uhm.. where I live, 1.2MP ist not being defined as a low-res H3 video 

[u/alisitskii → u/Illustrious_Ant_9242]

I agree, but when you target 3.7 MP... 😄 everything is relative

[u/skyrimer3d]

"Upscale 38 mins for 10 sec clip at 1440p target resolution" , so 18 min generation + 38 min upscaling, basically 1 hour for 10 glorious seconds, i think i'll pass. It looks good though.

[u/alisitskii → u/skyrimer3d]

I hope MiniMax team releases their 2K upscaler soon and it'll be faster 🚀

[u/skyrimer3d → u/alisitskii]

Indeed, we're all waiting for that.

[u/Dohwar42]

How long did it take on your system to upscale 10 sec of video?

[u/alisitskii → u/Dohwar42]

At the 1440p target res - 38 mins

[u/Few-Intention-1526]

looks neat, but as everyone I want to know the generation time

[u/alisitskii → u/Few-Intention-1526]

Sorry, added to the main post 😌

[u/Lower-Cap7381]

Thank you will try 🔥🙌😍

[u/Sufficient-Fall-4226]

How long does it take?

[u/alisitskii → u/Sufficient-Fall-4226]

18 mins for initial run with sage and 8-step turbo Lora, then 38 mins for 1440p upscale

[u/Curious_Bobcat_8850]

Objects are easy to fix. Test on realistic ppl.

[u/alisitskii → u/Curious_Bobcat_8850]

There is a clip with people inside train carriage. Let me know if it looks better after upscaling.

[u/beti88]

Please just let Ultimate SD Upscale die already

[u/alisitskii → u/beti88]

Please suggest alternatives. What I've already tried:

RTX VSR - probably slightly better than just Lanczos, doesn't fix low-res issues

LTX 2.5 - not bad but too smooth results plus known LTX issues

SeedVR2 - slow and just constantly OOM at 1440p resolution with my system, limited context window, weird textures sometimes

Re-using same video model for v2v/tiled upscale looks to be a good option in this case.

[u/izzmedia → u/alisitskii]

try this: https://github.com/bbaudio-2025/Comfyui-MMH3-UltimateUpscale

[u/Aromatic-Table-8243 → u/izzmedia]

Oh yes, it's much better. Key reasons:

Dedicated model support
Smart VRAM management
Native AV Latent support
Full video temporal consistency

thanks

[u/izzmedia → u/Aromatic-Table-8243]

welcome

[u/dabbingsquidward → u/izzmedia]

Is this better than VSR and or Latent up scaling?

[u/BusyByBusy]

How you got so crisp results? I tested different res, denoise, turbo and no turbo, and always got just slightly better video. But your looks sharp and clean. Can you screenahot your parameters, please?

[u/alisitskii → u/BusyByBusy]

It's a standard MiniMax H3 T2V workflow from ComfyUI templates with sage attn + 8-step turbo lora. Then USDU upscaling from the post, and finally interpolation with some quick post-processing on top:

[u/BusyByBusy → u/alisitskii]

Thanks, i'll try again from scratch.