SevTech: Ages2026-06-18 · 8 min read

How to Host a SevTech: Ages Server in 2026

SevTech: Ages is one of the most demanding progression modpacks ever made — 250+ mods, custom world generation and a strict age-gating system that loads complex data structures. Here's how to set up a dedicated server.

1

Choose your RAM — 8 GB minimum, 10–12 GB recommended

SevTech generates custom biomes and keeps age progression data in memory. Less than 8 GB causes consistent GC stalls during exploration. 10–12 GB is the real comfort zone for a group.

2

Download the server pack from CurseForge

Search "SevTech: Ages" on CurseForge and download the server files pack — not the client pack. The pack runs on Minecraft 1.12.2 with Forge. The server pack includes the correct Forge installer.

3

Run the Forge installer

Run `java -jar forge-installer.jar --installServer` inside the extracted server directory. SevTech is on 1.12.2 which requires Java 8. Do not use Java 11 or newer — the server will fail to launch.

4

Set Java 8 and increase startup RAM

Edit the start.sh script to point to your Java 8 installation and set `-Xms4G -Xmx8G` (or 10G if you have the RAM). SevTech's custom world generation needs RAM available from the first tick.

5

Accept EULA and let the first boot complete

Set `eula=true` in eula.txt, then start the server. First boot takes 8–12 minutes due to SevTech's custom world generation and data pack loading. This is normal — do not restart mid-gen.

6

Connect players

All players need SevTech: Ages client from CurseForge at the exact same version. Share the server IP on default port 25565. Age progression is per-player and tracked server-side.

FAQ

Which Java version does SevTech: Ages need?+
Java 8. SevTech runs on Minecraft 1.12.2, which requires Java 8. Do not use Java 11, 17 or 21 — the Forge version bundled with SevTech is not compatible with newer JVMs.
Why does the first boot take so long?+
SevTech generates custom biomes using its own world gen system and loads all age progression data structures on first start. 8–12 minutes is typical. Subsequent restarts are much faster (2–4 minutes).
Can players progress through ages at different rates?+
Yes — age progression is tracked per-player server-side. Two players can be in different ages simultaneously. Recipes and crafting options unlock individually based on each player's progression.
What is the minimum RAM for a SevTech server?+
8 GB is the minimum for a small group. Below that, you will see frequent GC pauses during biome exploration and age transitions. 10 GB is the real starting point for comfortable play.
Does SevTech: Ages work with Java 21?+
No. Minecraft 1.12.2 and the Forge version SevTech uses are not compatible with Java 21 or Java 17. You must use Java 8 — this is not optional.

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