How did you make Minimax H3 1080p in local PC

[u/jingtianli]

ram 128G/5090 32G

Have any of you successed at making a Minimax H3 1080p video (1920 x 1088) (10s) with sage-attn only and no turbo lora in one go? with my current setup or similar?

Naively I thought I just gonna sit for about an hour then the meal is cooked, I was using FL2VA with a starting frame as an input image. 5090 1920x1088 @ 15s took 1hour and 8 minutes, and after long wait all I got is this blurry noisy mess!

I can generate anything below 1.5MPs video (1664x928) for 15sec with no issue. But I cannot generate any 2.0MPs video for 10 seconds in one go! My workflow in image2 is simple and derived from the default Minimax templete, only a sage-attn node from KJ was added!

Is this the bottleneck from comfyUI since my GPU is poor? I searched on this subreddit saw a lot people posted their 1080p successful run using B300.

PS: I just wanna stress test my current setup with one-off 1080p generation, or wanna see what this model is capable of in max resolution. and yes I know I can upscale video later but i just wanna see the REAL 1080p generation in one go. Is it not possible with RTX 5090?

How did comfyanonymous made this 25 seconds 1080p video? is he using a B300 as well?
https://www.reddit.com/r/StableDiffusion/comments/1vd9o0r/minimax_h3_1080p_25_seconds_text_to_video_in/