DPM++ 2M Karras is my favorite sampling method. Gives good images with 20-30 steps. I usually turn the CFG up to like 8-9.5.
Standard checkpoints only produce good 512x512 images. XL checkpoints can do 768x768 up to 1024x1024.
I’m very sure I don’t have the right equipment to produce anything like that.
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What is your GPU?