Yup, 6x old i5 thinkpads will require more space, more power and will likely be more expensive than 6x Pi.

I'd take 6 old ThinkPad over 6 new Pi any day. :)

I host a lot out of my house on a T430S with a cracked screen.

I know there are thinkpad hoarders with like 10 or 20+ old thinkpads. Seems to be a nice hobby, but you will rarely find one who builds a thinkpad cluster.

In the case of Raspberry Pi it is pretty normal nowadays to connect a bunch of them into a cluster and have some fun. In fact, it has become so popular, that you u can find stackable cluster cases and other Pi cluster hardware on amazon.

Not when you factor in performance per watt.

I’d love to see the M1 on this list.