[blacksmith_tb]

I am still happily using a stock(ish) Xeon-based 'cheesegrater' tower at home, but if you wanted to just reuse an old (PPC or Intel) Mac Pro case to build a new system in, there are some ATX adapter kits available[1].

1: https://www.thelaserhive.com/product/mac-pro-atx-kit-with-ps...

[ben1040]

I had one of the Xeon Mac Pros and got way more use out of it than I expected after putting in an SSD. It felt like a brand new computer.

It was an "Early 2008" model and I finally replaced it in 2015.