Hosting a game server for friends on the same PC you play on is a classic setup, whether it is a survival world, a sandbox block game, or a small shooter lobby. The trouble is that the server and the game both want memory, and if you underestimate, everyone lags. Here is how to budget RAM so you can host and play smoothly without buying more hardware than you need.
Two Programs, Two Memory Budgets
When you self-host, your PC runs both the game client (what you see and play) and the server process (which simulates the world for everyone). Each needs its own slice of RAM, plus Windows and background apps take their share. The server’s appetite grows with the number of players, the world size, and mods, while the client’s needs stay closer to normal single-player.
Rough RAM Budget
| Setup | Server needs | Client + OS | Total RAM target |
|---|---|---|---|
| Small vanilla world, 2-4 players | 2-4 GB | ~12 GB | 16 GB |
| Modded world, 4-8 players | 6-10 GB | ~14 GB | 32 GB |
| Large or heavily modded, 8-16 players | 10-16 GB | ~16 GB | 32-64 GB |
| Multiple servers or big communities | 16 GB+ | ~16 GB | 64 GB |
16GB is the bare minimum and only works for small, vanilla worlds. Once mods and more players enter the picture, 32GB is the realistic target, and heavy communities push toward 64GB. Skimping here is the usual cause of the whole session stuttering when several friends join.
Beyond Raw Capacity
Hosting and playing at once also taxes the CPU, since the server simulation and your game both need processing. A CPU with enough cores lets the server run on some while your game uses others. Storage matters too: keeping the server and game on a fast SSD speeds world loading and reduces hitching when the server saves chunks. RAM is the first bottleneck, but it is not the only one.
Consider a Dedicated Lightweight Server
If you find your play experience suffering, running the server as a separate lightweight instance, or on an old PC or a mini machine, frees your gaming rig to focus on your client. Even a modest always-on box with 16GB can host many worlds while your main PC just connects as a normal player, which often feels smoother than hosting and playing on one machine.
Allocating Memory to the Server Correctly
Many self-hosted servers, especially Java-based ones, do not simply take what they need; you assign them a memory allocation up front. Set it too low and the server stutters or crashes as its world grows; set it too high and you starve your game client and Windows, causing the whole PC to swap and lag. The trick is to give the server enough for its expected player count and world size while leaving a healthy reserve for everything else. Watch actual usage during a busy session and adjust: if the server sits comfortably below its allocation, you can trim it to free room for your client. If it repeatedly bumps the ceiling, raise it, but only if your total RAM has the headroom. Getting this split right often matters more than raw capacity, because a well-tuned 32GB machine can outperform a carelessly configured one with more memory.
FAQ
Can I host a modded server and play on 16GB of RAM?
It is risky. Modded servers can need 6-10GB on their own, and adding your game client plus Windows can exceed 16GB, forcing slow swapping that lags everyone. For modded hosting while you play, 32GB is the sensible minimum to keep both sides responsive.
Does the server or the client need more memory?
It depends on scale. For small worlds the client and OS dominate. As players and mods increase, the server’s memory use climbs and can surpass the client. Budget separately for each, size the total to cover both plus Windows, and add headroom for the world growing over time.
Bottom Line
Hosting a game server on your gaming PC means budgeting RAM for the server, the client, and Windows all at once. 16GB only suffices for small vanilla worlds; 32GB is the practical target for modded worlds with a handful of friends, and 64GB serves large or heavily modded communities. If performance still suffers, offloading the server to a separate machine lets your main rig focus on smooth play.
