"Just add more RAM" is the most common advice for a laggy game server, and it is right about half the time. RAM matters, but so do CPU speed and player count, and past a point extra memory does nothing. Here is how much you actually need, by game, and how to tell when RAM is the real bottleneck.
The short answer, by game
These are practical starting points for a small to medium community server. Scale up with player count and mods.
| Game | A few friends | Medium community | Note |
|---|---|---|---|
| Minecraft (vanilla) | 2 GB | 4 GB | Add about 1 GB per 4 to 6 players |
| Minecraft (modpacks) | 6 GB | 8 to 12 GB | Modpacks are very memory hungry |
| Rust | 8 GB | 16 GB | CPU per-core speed matters as much |
| Palworld | 8 GB | 16 GB | Memory is usually the limit |
| ARK: Survival Ascended | 16 GB | 32 GB | Heaviest of the common games |
| Valheim | 4 GB | 8 GB | Light compared to the rest |
Why more RAM is not always the fix
RAM only helps if you were short on it. Once the game has enough headroom, adding more does nothing for your tick rate. Two things people miss:
- CPU per-core speed usually decides smoothness. Most game servers lean on one core, so a fast single core beats a pile of slow ones. This is why a server with "lots of cores" on a cheap host can still stutter.
- Over-allocating can backfire. Oversized memory heaps, especially in Java games like Minecraft, can cause longer pauses rather than shorter ones. Match the allocation to the need.
How to tell if RAM is your problem
- Watch memory use under a full load. If it sits near the limit and the server stalls, you need more.
- If memory has headroom but the server still lags, the bottleneck is CPU, disk or a heavy plugin, not RAM. See How to fix game server lag.
- Frequent short freezes in Java games often point to garbage-collection pauses from a badly sized heap, not a shortage.
Rule of thumb for plugin and mod servers: start with the medium figure above, watch real usage at peak, then adjust. Guessing high wastes money; guessing low causes stalls.
FAQ
Does more RAM increase FPS or reduce lag?
Only if you were short on RAM. Beyond what the game needs, extra memory does not improve tick rate, and per-core CPU speed usually matters more.
How much RAM for 20 Minecraft players?
Around 4 to 6 GB for a plugin server, and more for modpacks. Lower the view distance if it still struggles.
Is it better to over-allocate RAM to be safe?
No. Right-size it. Especially in Java games, an oversized heap can make pauses worse, not better.
Not sure what your server needs? Tell us your game and player count and we will size a plan that runs smoothly.