Macs have never been a good choice for render farm render nodes. The ideal render nodes are something like a dual twin supermicro box running linux or windows.

Macs have never been a good choice for render farm render nodes. The ideal render nodes are something like a dual twin supermicro box running linux or windows. In a 1U rackmounted server like that you can throw in 4 CPUs (and each CPU could have 18 cores if you are using E5-2699v3 cpus, so you'd get 72 cores in a single 1u server).