RAM (Random Access Memory) is a computer's short-term data storage, where the data that the server is
currently using is stored. In case of Minecraft servers, it is used to store information about your
Minecraft world and players. The higher RAM means the higher storage for your server to store
How much RAM do I need?
We would recommend you to settle with around 3-4 GB for your minimal
configured Minecraft server (SMP). 6+ GB RAM would be only advisable in case of high amount of players
or/and complex server configuration.
NOTE! High amount of RAM is not always good for your
server since it could be mostly eaten by memory leaks (poor coded plugins) for no extra benefit.