How Much RAM and CPU Do You Actually Need for a Game Server?

One of the most common questions when setting up a home game server is simply: “will my hardware handle this?” The honest answer is “it depends on the game,” but there are consistent patterns across titles that make it easy to plan. Here’s a practical breakdown for the games we cover most.

Why RAM and CPU Matter Differently

RAM determines capacity — how many players can connect, how large your world can grow, and how many mods/plugins you can run before things become unstable. Running out of RAM causes immediate crashes, not gradual slowdown — there’s no “optimizing around” insufficient memory.
CPU determines responsiveness — how fast the server “thinks,” including tick rate, physics calculations, and world generation. For most game servers, single-thread performance matters far more than core count — a CPU with fewer, faster cores will usually outperform one with more, slower cores.

RAM Requirements by Game

Minecraft (Java Edition):

Small vanilla server (2-5 players): 4-6GB
Medium server or lightly modded: 6-8GB
Heavily modded or optimized for 50+ players: 8-10GB+ (well-configured plugins can support surprisingly large player counts on modest RAM)

Valheim:

Vanilla, up to the 10-player hard cap: 4GB
Modded (BepInEx frameworks like Valheim Plus): 8GB
Valheim has a hard cap of 10 concurrent players regardless of hardware, so unlike other games, you can’t scale player slots up — a modest machine comfortably handles a completely full server

ARK: Survival Ascended:

This is one of the most demanding games you can self-host. Even an empty server can sit at 3-4GB of baseline usage.
Basic single-map server: 14-16GB minimum for real stability
Running a clustered setup (multiple maps simultaneously): roughly 12GB per additional map
Mods add further overhead — each one typically costs 50-200MB, and a heavily modded server with 15-20 mods adds up quickly

General rule of thumb across lighter games (Terraria-style, casual titles): 4-6GB is usually sufficient. Medium-weight games (vanilla Minecraft, Palworld): plan for 6-8GB. Heavy games (Rust, ARK): budget 10GB or more.

CPU Requirements

Minecraft: Benefits heavily from high single-thread clock speed, especially for world generation and chunk loading. A modern CPU with strong boost clocks outperforms an older chip with more cores.
Valheim: A 4-core CPU with a base clock above 3.0GHz is the general recommendation — world generation and physics lean heavily on single-thread performance. Below 3GHz, you’ll start noticing rubber-banding during exploration.
ARK: Similarly benefits from strong single-thread performance, compounded by the sheer number of entities (dinosaurs, structures, items) it needs to track simultaneously.

Across all of these games, the pattern holds: prioritize single-thread speed over raw core count when picking hardware, which lines up with what we recommend in our mini PC hardware guide.

A Note on Memory Leaks

Several modern game servers (Palworld and ARK: Survival Ascended notably) are known to suffer from memory leaks — RAM usage climbs gradually over time even without more players joining, until a restart clears it. If you’re hosting either of these, scheduling an automatic restart every 4-6 hours is a practical workaround, not just a nice-to-have.

Storage Considerations

Beyond RAM and CPU, don’t overlook storage:

NVMe SSDs matter more than raw capacity for most game servers — fast read/write speeds reduce world-loading lag and stutter during autosaves
Budget roughly 10-20GB for a basic server, and 30-60GB or more for a long-running, heavily modded, or multi-world setup, factoring in updates, logs, and backup generations

Putting This Into Practice

If you’re hosting a single game for a small group of friends, a budget mini PC is genuinely enough — see our hardware guide for specific tier recommendations. If you’re planning to run multiple demanding games simultaneously (especially ARK), you’ll want to size up to a mid-range or higher machine with 16GB+ RAM to have real headroom.

Ready to get started? Check our guides for setting up a Minecraft server or setting up a Valheim server.