You can get things like Epyc mini-ITX boards ( https://www.anandtech.com/show/16277/asrock-rack-deep-mini-itx-romed4id-2t https://www.anandtech.com/show/16277/a

You can get things like Epyc mini-ITX boards ( https://www.anandtech.com/show/16277/asrock-rack-deep-mini-itx-romed4id-2t https://www.anandtech.com/show/16277/asrock-rack-deep-mini-i... ) if you're just looking to ramp up the compute in a tiny space. Divide it up into 6 VMs if you still want it to be a cluster even.