Related: I wrote up instructions for running Stable Diffusion on GCE. I used a Tesla T4, which is probably the cheapest that can handle the original code. If you're spinning up an instance to play with, rather than to batch-process, then cheaper makes more sense because most of the machine's time is spent waiting for you to type stuff and look at the results.

https://sowbug.com/posts/stable-diffusion-on-google-cloud/