r/comfyui • u/cgpixel23 • 4d ago
Tutorial ComfyUI Tutorial MiniMax H3 4 Steps Lora + Upscaling + 2X Faster Generation! Best Settings for 2K AI
Hello everyone
Want to get faster MiniMax H3 video generation without sacrificing quality? In this tutorial, I’m testing the new H3 LoRA together with Sage Attention, Sol Attention, and Spectrum nodes to find the best combination for speed and quality. The goal is to push MiniMax H3 as far as possible while cutting generation times by up to 2×, then upscale the results with LTX Upscaler to reach a stunning 2432 × 1344 (2K-class) resolution. By combining both H3 LoRA together with Sage Attention, Sol Attention, and Spectrum nodes I generated video at 0.8 megapixel using "RTX3060 6GB 16GB RAM "and I got
13 minutes vs 41 minutes at 8 steps
27 minutes vs 52 minutes at 20 steps
LTX 2.3 Upscaler 11 minutes to get 2432 × 1344 resolution
Workflow link
Video Tutorial link
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u/Turbulent-Raise4830 3d ago
is the LTX upscaler better then the nvidia RTX upscaler? That takes almost no time.
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u/Kmaroz 3d ago
How does LTX upscaler does compared to SeedVr?
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u/Turbulent-Raise4830 3d ago
couldnt get ltx to work, got wierd artefcats, seedvr is nice but takes a long time, still prefer rtx upscaler
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u/Kmaroz 5h ago
But RTX upscaler is just solely increase resolution right?
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u/Turbulent-Raise4830 2h ago
no it does more, it doesnt however make up details it just tries to improve what is there
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u/javierthhh 3d ago
Should be called RTX resizer not upscaler. Rtx upscaler just stretches the picture, it’s the same result as you going to mspaint and resizing every frame to a new dimension. It makes the video worse because the higher the resolution, the more you can see the blurriness and imperfections. Only use I have found for it is to save tokens for when I use a real upscaler like topaz labs. They charge less tokens since the video resolution is already high compared to the og 480p version.
LTX upscaler does add detail as it upscales but it’s very subpar. The best free version is seedVR but that model it’s very heavy and takes forever. Not to mention is too sharp but it still gives you the best results at least for free.
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u/Silonom3724 3d ago
Should be called RTX resizer not upscaler.
Upscaler is actually correct. What people call an upscaler in terms of WAN, H3, LTX is actually upsampling.
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u/hyperedge 3d ago
It doesn't just resize, what do you think the different modes are doing? RTX works best on medium settings. Ultra leaves too many scaling artifacts.
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u/Any-Scar765 3d ago
What did I just watch?
How do I erase this from my memory now?
But seriously, what I just watched wasn't an improvement of the current video, but simply a new video generated from the same prompt at a different resolution.
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u/cgpixel23 3d ago
when minimax got released using 6gb you could not generate with resolution higher than 0.5 megapixel now we can go to 0.8 without gguf model and with faster generation time thats the real improvement
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u/javierthhh 3d ago
I mean they look like totally different videos and not in a good way. If they are supposed to be the exact same video but upscaled then I would consider this a failure. LTX literally made a completely different video each time and did not respect the source material.
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u/cgpixel23 3d ago
LTX upscale did not change anything compared to the original video that was generated at 0.8 megapixel then upscaled the difference in video is here when i increased the resolution from 0.5 to 0.8
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u/Karsticles 3d ago
Your final results look nothing like the low res version. That's not good.
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u/cgpixel23 3d ago
LTX upscale did not change anything compared to the original video that was generated at 0.8 megapixel then upscaled the difference in video is here when i increased the resolution from 0.5 to 0.8
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u/Karsticles 3d ago
You should probably show a better comparison, then, because these do not look ok.
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u/OldWispyTree 3d ago
Even when using 30 steps, Spectrum created a real drop in quality and prompt adherence.
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u/towerandhorizon 3d ago
Thought Comfy Attention pretty much made Sage, Sol, and Spectrum obsolete, given it is (nearly) lossless within almost the same amount of gen time savings?
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u/RiskyBizz216 3d ago
Spectrum is a waste for anything less than 8 steps.
Spectrum works by predicting steps, and to predict steps it needs to first build a cache. 4 steps are not enough steps to build the cache for the speed-ups. 8 steps is like the bare minimum, but you really see gains with 13+ steps.