Being a server is not about power, a $5 Digital Ocean VPS is a server and it has way less power than Macbook Air you mention as a client. The only thing about a

Being a server is not about power, a $5 Digital Ocean VPS is a server and it has way less power than Macbook Air you mention as a client. The only thing about a server is that it serves to non local user(s) - it could be could be low powered ARM based RPi or a multi-core Intel thing, it really just depends on it's workload. The Mac Pro is designed as client and same for all current Macs (they don't sell a server anymore), which is how they are typically used.