How Much RAM Does a Game Server Actually Need?
Real RAM numbers for Minecraft, Rust, ARK, and other popular game servers, plus why player count is only half the story.
The honest answer is "it depends," but that is useless when you are staring at a list of plans trying to decide between 4GB and 8GB. So let us put real numbers on it.
RAM is usually the thing that decides whether a game server runs smoothly or stutters, more so than the CPU for most titles. Run out of it and the server starts swapping to disk, frames drop, players rubber band around, and everyone has a bad time. The goal is to have a comfortable amount of headroom, not to buy the biggest number you can find.
Minecraft
Minecraft is the one everyone asks about, partly because the answer changes so much depending on how you play it.
A small vanilla survival server for you and a few friends runs happily on 2GB to 4GB. Nothing fancy needed.
Add mods or a big plugin list and the picture changes fast. A modded pack like one of the popular kitchen sink packs can want 6GB to 8GB on its own before a single player joins, because every mod loads its content into memory. Heavy modpacks with hundreds of mods can ask for 10GB or more.
The other multiplier is world size and view distance. Players exploring new chunks force the server to generate and hold more of the world in memory. A server with a render distance cranked up and a big explored map uses far more than the same server with conservative settings.
Rough guide for Minecraft:
- Vanilla, up to 10 players: 4GB
- Light plugins, up to 20 players: 6GB
- Modded packs: 8GB and up
- Large modded community: 16GB
Rust
Rust is hungry. The map size is the big lever here. Rust holds the entire map and every entity on it in memory, so a large map with a full server can sit comfortably in the 12GB to 16GB range. A smaller map for a private group is gentler, but Rust is not a game where 4GB will get you far. Plan for 8GB as a sensible floor and 16GB if you want a full wipe cycle with a small population. As you grow you'll end up needing more RAM.
ARK: Survival
Another heavy one. ARK servers want a lot of memory because of how much they track, structures, tamed creatures, the whole persistent world. 8GB is a realistic minimum for a small server and 16GB is more comfortable once a tribe gets established and starts building. Running multiple maps in a cluster multiplies this, since each map is effectively its own server process.
The lighter end
Plenty of popular games are far easier on RAM. A Valheim server for a group of friends is happy on 4GB. Terraria barely needs anything. Counter-Strike and most source engine servers are modest. Palworld lands somewhere in the middle and benefits from 8GB once you have a few people on.
The part people forget
The game is not the only thing using memory. Your operating system needs some, usually a few hundred megabytes for a lean Linux setup. If you run anything alongside the game, a Discord bot, a web map, a database, that needs its own slice too. Always leave yourself a buffer rather than sizing your plan to the exact number the game wants at idle.
A good rule: take the realistic busy-server figure for your game, then go one plan tier up. The extra headroom is cheap insurance against the laggy night when the server fills up and you wish you had it.
Picking a plan
If you are hosting Minecraft for friends, our 6GB or 8GB plans cover almost every modded setup. For Rust or ARK at a real population, look at 16GB and up. Every plan can be upgraded later without rebuilding anything, so if you guess low you are not stuck. Start where you think you land, watch how it runs on a busy night, and bump it up if the memory gets tight.