Well, honestly, just about any machine will run it, it's just how long you're willing to wait for it to generate one image. The machine I'm running it on isn't anything special. It's a laptop that's a few years old that's had a ram upgrade. Doesn't even have an nvidia gpu. It takes on average 45 minutes for one image to generate at a pretty low resolution and then upscale. I'm patient though and it makes you think carefully about the prompt before running it.