64GB RAM for 4 game servers isn't overkill.

No. 16GB might technically cover the base requirement, but game servers — especially Minecraft — eat memory for breakfast.

Each server might be allocated 4GB, but Java doesn’t behave that cleanly. It grabs more for garbage collection, chunk loading, and mod overhead. Add an OS, a monitoring tool, a backup script, and suddenly you’re brushing against 24GB during peak play. Then someone wants to spin up a fifth server or a modpack that wants 8GB. Now what?

You’re not buying RAM for today’s usage. You’re buying it so you don’t have to think about memory for the next couple years. 64GB gives you headroom for spikes, extra instances, and the inevitable “let’s try a different game server” weekend.

Future You deserves not having to micromanage swap files.