What do you want to self host? To learn or experiment buy a cheap old x86 box. I get mine at goodwill auction. Otherwise desktop is good if you want something that needs more compute and that you’d spin up as needed vs always on.

I see you

It has a laptop style fan for the cpu. I’ve never noticed any noise but I have it off in a corner and near some noisy af parakeets so it’s silent to me.

I am running my home server on a Dell 3050 from shopgoodwill.com and it was ~$40 without hard drives. It has room for an m2 drive and SSD so I have Ubuntu/Docker on the m2 and all my data on an SSD.