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Why Modded Servers Need More Resources
Mods (via Forge or NeoForge) add substantially more server-side computation than plugins — new entities, custom world generation, additional tick logic — meaning a modded server with the same player count as a plugin server typically needs 2-3x the RAM to run smoothly.
Sizing for Common Modpack Types
Light modpacks (20-40 mods, mostly QoL/tech-lite): 4-6GB. Medium packs (40-80 mods, some tech/magic mods): 6-10GB. Heavy packs (100+ mods, complex tech chains like GregTech-style packs): 10-16GB or more depending on the specific pack's documented requirements.
Setup Specifics for Modded Servers
You'll need the exact Forge/NeoForge version matching your modpack, matching mod versions between server and all clients, and often a curated modpack installer (CurseForge/Modrinth) that handles version-matching automatically rather than installing mods individually.
Frequently Asked Questions
How much more RAM does a modded server need vs vanilla?
Typically 2-3x more RAM than an equivalent vanilla/plugin server for the same player count, depending on how mod-heavy the pack is.
Do all players need the exact same mod versions?
Yes — mod version mismatches between server and client are one of the most common causes of modded server crashes and connection failures.
Can I add mods to an already-running server?
It's possible but risky for world compatibility — some mods require a fresh world or careful migration steps, so check each mod's documentation before adding it to an existing server.
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