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Problem is the computing power necessary to implement those bigger models increases by some large value as well. An 81MP images is 81 times bigger than a 1MP image. Not sure exactly how the generation is implemented, but I am sure it probably becomes unaffordable if its linear.

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It might require dedicated hardware. That only really becomes possible when you've proven the idea, but ASICs for cryptomining, TensorFlow, etc are quite real. There's no reason why dedicated hardware for training Stable Diffusion couldn't happen.

It's mostly a VRAM limitation at this point though, since even a 81x slowdown with something like Stable Diffusion would be perfectly acceptable to produce the final high-quality render.

Which is to say, it sounds like the solution is dedicated GPUs that focus on VRAM over speed.

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