How Much RAM Does a Project Zomboid Server Need?
A vanilla Project Zomboid server runs well on about 2 to 3 GB of RAM for a small group, and you should add memory as you invite more players and stack on Workshop mods, especially large map packs.
2 min read · Updated Sep 24, 2026 · By GuavaHost Team
The short answer
For a plain, unmodded server, rough RAM targets are:
- 2 to 4 players: around 2 to 3 GB.
- 6 to 8 players: around 4 to 6 GB.
- 10 to 16 players: around 6 to 8 GB.
Project Zomboid loads the world in chunks as players move around, so the more people you have exploring different areas at once, the more memory the server holds open.
Mods change everything
Mods are the biggest single factor in how much RAM you need. Content mods add a little each, but large map packs are the heavy hitters, because every extra map region is more world for the server to keep loaded. A big modlist with several map add-ons can easily need 8 to 12 GB or more, even for a modest number of players.
A simple rule of thumb
Start with about 2 GB as a base, add roughly half a gigabyte per active player, then add headroom for your mods on top. A lightly modded six-player server lands comfortably around 4 to 6 GB, while a heavily modded server with big maps wants a lot more.
Signs you need more RAM
- Players rubberband, teleport or lag when several are online in different towns.
- The server stutters or freezes while saving.
- The Console log shows out-of-memory errors, or the server crashes during startup while loading mods.
If you see these, the fix is usually more memory rather than anything in your config.
RAM is not the only thing
More memory stops the server running out of room, but it will not fix everything. Project Zomboid leans heavily on single-core CPU speed, which is why GuavaHost runs high-clock AMD Ryzen and Intel hardware. If your RAM is comfortable but the world still stutters with lots of zombies or players packed into one spot, that is usually CPU load, not a memory shortage. NVMe SSD storage also keeps chunk loading and saves quick.
Upgrading is easy on GuavaHost
Every GuavaHost plan is fully configurable, so you pick your RAM at checkout and change it whenever you like. If your server starts to feel tight, open your server in the control panel at customer.guavahost.com, choose Manage plan in the server menu, then Change plan, and pick a bigger size. Restart the server afterwards so it picks up the new memory. Billing is prorated, so you only pay the difference for the rest of your cycle, and your world and settings stay exactly as they were.
It is fine to start modest and scale up. Many owners launch on a smaller plan, watch how the server behaves once friends and mods pile on, then add RAM once they know their real needs.
Still stuck? Jump into our Discord at discord.gg/GuavaHost and the team will help you out.
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