Core Keeper The further your group digs, the more the server has to track. Core Keeper’s underground world is procedurally infinite, and as players push out into new biomes, the server loads and holds that chunk data in memory. A fresh world at session one and a world with 80 hours of exploration have very different memory footprints, even with the same player count.
This guide breaks down how much RAM your Core Keeper dedicated server actually needs, based on player count, world age, and whether you’re running mods.
What Core Keeper Uses RAM For
Unlike some games where RAM is mostly about player count, Core Keeper ties memory usage heavily to world exploration. Every area your group uncovers gets loaded into the server’s chunk cache. That cache grows session over session and doesn’t shrink back down when players log off. A world that’s been played for a few weeks will consume meaningfully more RAM than it did on day one.
There’s also a quirk worth knowing if you’re self-hosting on Linux: the Core Keeper dedicated server requires a virtual framebuffer (Xvfb) to run, because the engine uses OpenGL for world generation even on headless systems. Managed hosts, including WinterNode, handle this automatically, but it’s part of why the server’s baseline memory footprint is higher than you might expect for a 2D game.
The world simulation also runs continuously regardless of whether anyone is online. If you’re hosting an always-on dedicated server with an older world, it’s drawing RAM even at 3 AM with zero players.
RAM Requirements by Player Count and World Age
There’s an outdated figure floating around in some guides from 2022 that puts Core Keeper’s minimum at 12-15GB. That was from the early access period before the server was properly optimized. The current picture, post-1.0, is much more reasonable.
| RAM | What it works for |
|---|---|
| 4GB | 1-3 players, fresh or lightly explored world, no mods |
| 6GB | 2-6 players, established world, light mods or none |
| 8GB | 4-8 players, older world with significant exploration |
| 10GB | 6-8 players, heavy mod load, large explored map |
4GB is the hard minimum for a running server instance. It works, but it’s tight. If you’re starting with a fresh world and a small group, you’ll get by. Add mods or a few dozen hours of digging and you’ll start feeling the ceiling. 6GB gives you actual breathing room for a typical friend group, and it’s where we’d point most server owners as a starting plan.
World Age Matters
A server world that’s been explored for 50+ hours can use noticeably more RAM than a fresh one with the same player count. If your server starts feeling sluggish after a few weeks of play, RAM is one of the first things worth checking.
How Mods Affect RAM
Core Keeper’s official mod support runs through mod.io as of the 1.0 release. Thunderstore still exists but now redirects to mod.io for the official database. Mods are installed server-side and loaded when the server starts, so every mod your group uses adds to the baseline memory footprint.
The impact varies considerably by mod type. Quality-of-life mods, the kind that adjust stack sizes, automate tasks, or add UI tweaks, are light. Most of them add a negligible amount to RAM usage and you can stack several without worrying. Content mods are a different story. Anything that introduces new biomes, entities, or items increases what the server has to simulate and cache.
A practical rule of thumb: if you’re running a handful of QoL mods, the base RAM tiers above still apply. If you’re running a major content pack or several content mods together, add 1-2GB to whatever tier you’d normally land on.
Mod Compatibility
Always verify your mods are compatible with the current version of Core Keeper before installing them on a dedicated server. The game updates regularly, and some mods lag behind. Running incompatible mods can cause crashes or world corruption.
A Few Other Things Worth Knowing
Core Keeper officially supports up to 8 players per server. There’s no hard cap enforced by the server software, but past 8-10 players, performance degrades noticeably. At that point, CPU becomes as much of a limiting factor as RAM. The server has to process mob AI, world physics, and player actions for every connected client simultaneously, and that load scales with player count.
This is where unmetered CPU access matters. Some hosts throttle CPU usage or limit thread counts per server, which creates a ceiling on how much processing the server can actually do. If you’re pushing toward a full 8-player server or running content-heavy mods, having full CPU access makes a real difference in how smoothly the game runs for everyone.
How Much RAM Does WinterNode Recommend?
For most Core Keeper server owners, 6GB is the right starting point. It covers small-to-medium groups, handles light mods without issue, and leaves enough headroom that you won’t hit the ceiling a few sessions in. A 6GB Core Keeper server from WinterNode runs $11.94/month.
If you’re just starting out with a couple of friends and want to keep costs low, 4GB works as a floor and runs $7.96/month. Keep in mind it’s a tighter fit as the world ages.
For larger groups running closer to the 8-player cap, or if you plan to run content mods alongside a well-explored world, 8GB at $15.92/month is the more comfortable choice.
You can upgrade your plan at any time from the control panel, so starting at 6GB and moving up later is a reasonable approach.
WinterNode’s Core Keeper servers are $1.99/GB of RAM with no extra charges for CPU usage, NVMe SSD storage, or DDoS protection. All servers deploy to the same hardware regardless of plan size.
If you have questions about setup or want a second opinion on which plan fits your situation, our support team is available via ticket and Discord. We also have a Core Keeper help center.
Frequently Asked Questions
A Core Keeper dedicated server needs at least 4GB of RAM to run. For most groups of 2-8 players, 6GB is a comfortable starting point. Modded servers or older worlds with lots of exploration benefit from 8GB or more.
Yes, but 4GB is a tight floor. It works for small groups on a fresh world with no mods, but leaves little headroom as the world ages or player count grows.
Core Keeper supports up to 8 players officially. Performance starts to degrade past that without substantial RAM and CPU resources.
Yes. As players explore further underground, the server loads and caches more world chunks. An older, heavily explored world will use noticeably more RAM than a fresh one.