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Forge, Fabric, and modpacks like RLCraft and All the Mods — how to set them up, and how much RAM they really need.
Modded Minecraft is where the game gets truly custom — new dimensions, machines, magic, and hundred-mod packs like RLCraft, All the Mods, and Create-based worlds. Hosting a modded server is more involved than vanilla: you have to match the mod loader, the version, and enough RAM to keep it stable. This guide covers Forge and Fabric, installing individual mods and full modpacks, and what resources you actually need.
Mods do not run on a vanilla server — you need a mod loader, and the two dominant ones are Forge and Fabric. Forge is the long-established loader behind most large content modpacks (RLCraft, most All the Mods versions). Fabric is lighter and faster to update, popular for performance and smaller mods. Crucially, Forge mods and Fabric mods are not interchangeable: every mod you install must match both the loader and the exact Minecraft version. NeoForge, a Forge fork, is also increasingly common for newer packs.
To run a hand-picked set of mods on a Forge or Fabric server:
Most people run a curated modpack rather than assembling mods by hand. A modpack bundles dozens or hundreds of compatible mods plus configs. To host one, use the pack's server files: download the server pack from CurseForge or Modrinth, upload it to your server, and start it. On FluxCraft you get full file access, so you upload the server pack and launch it directly. Always use the version of the pack that matches what your players have installed in their launcher — mismatched pack versions will refuse to connect.
This is the number one reason modded servers lag or crash. Mods load enormous amounts of content into memory, so a pack that runs fine on 4 GB for one player may thrash with a handful of players. As rough guidance: light packs want 4–6 GB, medium packs 6–8 GB, and heavy packs like RLCraft or large All the Mods versions need 8–12 GB or more. World generation and exploration in modded worlds is especially demanding — give the server generous RAM and expect to size up as the pack grows.
Match every version exactly (loader, Minecraft version, and pack version), take backups before adding or updating mods, and update the whole pack at once rather than swapping single mods. Watch the server console after every change — modded crashes almost always name the culprit mod in the log. Because modpacks change so much between versions, a clean backup is your safety net.
Light packs run on 4–6 GB, medium packs want 6–8 GB, and heavy packs such as RLCraft or large All the Mods versions need 8–12 GB or more.
Both are mod loaders, but their mods are not interchangeable. Forge powers most large content packs; Fabric is lighter and updates faster. Each mod must match the loader and Minecraft version exactly.
Yes. Download the pack's server files, upload them to your server, and launch. Make sure the pack version matches what players have in their launcher.
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