Server/Requirements/Dedicated

It should be noted that these suggestion presume default settings in server.conf - i.e., a Draw Distance no higher than 10, and is also based on a new world; the bigger the world gets, especially if there's advanced redstone circuitry at work, the requirements - especially the RAM, or in the case of lots of redstone or mobs (in e.g. grinders), the CPU - increase significantly (to the point where a major world with several camps, redstone machinery, grinders, etcetera can easily more than double the requirements).

User Grade

 * 1 player ~ 50-100 MB of Ram - on it's own, but in practicality, it will always pull more, if it's e.g. in different chunks, moving through chunks very quickly (e.g. on a boat or via rail); the player object as such won't use/drain more RAM, but it will effectively lead to significantly more RAM being used by the server if it's doing anything besides standing perfectly still somewhere.

Win NT/2K/XP

 * Note that these requirements are for the server only you will need to allocate more resources to the OS!

Win Vista/7/8

 * Note that these requirements are for the server only you will need to allocate more resources to the OS!

Win 2003

 * Note that these requirements are for the server only you will need to allocate more resources to the OS!

Win 2008

 * Note that these requirements are for the server only you will need to allocate more resources to the OS!

Unix (Linux, BSD, Mac OSX)

 * These requirements apply to the Native Java for Unix, and not windows emulation using Wine or Mono.

GUI

 * Note that these requirements are for the server only you will need to allocate more resources to the OS!

Console

 * Note that these requirements are for the server only you will need to allocate more resources to the OS!