Datacenter cpus are actually really good for NASes considering the explosion of NVMe storage. Most consumer CPUs are limited to just 5 m.2 drives and a 10gbit NIC. But a server mobo will open up for 10+ drives. Something cheap like a first gen Epyc motherboard gives you a ton of flexibility and speed if you’re ok with the idle power consumption.
if you’re ok with the idle power consumption
I’m kind of not. I don’t need a ton of drives, and I certainly don’t need them to be NVMe. I just want 2-4 SATA drives for storage and 1-2 NVMe drives for boot, and enough RAM to run a bunch of services w/o having to worry about swapping. Right now my Ryzen 1700 is doing a fine job, but I’d be willing to sacrifice some performance for energy savings.