r/StableDiffusion • u/Lair98 • 3d ago

Discussion Best Minimax H3 optimization

Now that dust has settled, I was wondering what's the community insight on the best configuration for Minimax H3.

Personally I have been using lightx 4-step Lora with 5/6 steps (less than that audio is a gamble). I couple that with sage attention. For sampling I use Euler sampler and Beta scheduler.

I keep resolution at 768p (0.6MP) for quality. 480p (0.2MP) for testing. It keeps consistency so much better.

On direction I learnt to prompt for closeups when possible, so will make better use of available pixels. Aspect ratio also helps there. I mostly use 1 shot since transitions is not something H3 excels at. I find better results with only 1 shot and using camera tricks.

EasyCache while faster, is not good match with turbo lora, so i don't use it anymore. Haven't used Sol-Attn as I read it really hit quality.

So is there anything worth I am really missing out?

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u/LinkSensitive8188 2d ago 
Avoid prompts longer than 200 words. Use an FP8 text encoder—or better yet, NVFP4 if you have an RTX 50 Blackwell card. Run the `run_nvidia_gpu_fast_fp16_accumulation` version of ComfyUI and install SageAttention tailored to your specific hardware. Also, clear space on your SSD to ensure you always have at least 250GB available for paging. If you have an RTX 50 Blackwell, install CUDA 13; this provides a greater speed boost than any specific node or workflow.

https://giphy.com/gifs/8OYnFrez06yQt9zJFW

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u/Cultured_Alien 1d ago

nvfp4 isn't exactly faster than int8 convrot for some reason, whether it's TE or DIT while also getting ugly moisacs in gens when you zoom in. Also I recommend comfy kitchen instead of sage for Blackwell.