The question we get most about modpacks is not which one is the most fun, but how much memory it needs. Fair enough: running a modpack on too little RAM gives you crashes and a TPS that drops below 15, and everyone on the server notices immediately. Here is what each popular pack actually asks for.
Why modpacks need so much more than vanilla
A vanilla Minecraft server runs fine on 2GB. A modpack loads hundreds of extra blocks, items, recipes and world dimensions into memory before a single player joins. A pack like All the Mods 10 ships around 500 mods. All of them get registered at startup, and that memory stays occupied for as long as the server runs.
On top of that, most modern packs target Minecraft 1.21 and require Java 21. Still on an older Java version? The pack simply will not start.
Memory usage per modpack
| Modpack | Type | Memory | Our plan |
|---|---|---|---|
| SkyFactory 4 | Skyblock, light | 4 to 6GB | Redstone or Gold |
| Pixelmon | Pokemon, medium | 4 to 6GB | Redstone or Gold |
| DawnCraft | Action RPG overhaul | 8 to 10GB | Obsidian or Barrier |
| All the Mods 10 | Kitchen sink, heavy | 10 to 12GB | Barrier or Bedrock |
SkyFactory 4
The classic skyblock experience and still the friendliest pack to start with. The world begins literally empty, which saves on chunk generation and therefore on memory. A good first choice if you have never run a modpack before.
Pixelmon
Catch, train and battle Pokemon inside Minecraft. The pack itself is not extreme, but Pixelmon servers tend to attract a lot of concurrent players. Budget for 6GB rather than 4 once you open the server up.
DawnCraft
A full overhaul into an action RPG, with classes, bosses and Souls-style combat. World generation is heavily modified, which pushes memory usage up. Below 8GB this pack becomes uncomfortable.
All the Mods 10
The heaviest pack on this list and the 2026 flagship: tech, magic, storage and exploration in a NeoForge 1.21 package of roughly 500 mods. Expect 10 to 12GB and a startup time of several minutes. This is not a pack to try on a tight plan.
NeoForge or Forge
For new installs on 1.21 and later, NeoForge is now the default. Most large packs have moved over. Running an older pack still means classic Forge. Fabric remains the lightest option and is mainly interesting if you only want performance mods without a full pack.
Installing a modpack with us
Our game panel includes a modpack installer that talks to CurseForge. You pick the pack, we set the right Java version and startup flags. If your plan turns out to be too tight, you scale memory up without rebuilding the world.
Frequently asked questions
Can I add more RAM later?
Yes. Your world and settings stay in place, only the allocated memory changes. Useful when a pack disappoints or your server grows.
Why does my modpack fail to start?
In most cases it is the Java version. Packs on 1.21 need Java 21, which you set per server in the panel.
How many players fit on a modded server?
Roughly half of what vanilla handles at the same memory. Modpacks are heavier on both memory and CPU per player.
Want to size the memory first? Read how much RAM your Minecraft server needs. Already running and seeing stutters? Reducing Minecraft server lag covers that. All plans and specifications are on Minecraft hosting.
