// modpack server guide
GregTech: New Horizons (GTNH) server hosting & setup guide
A GTNH server needs about 6–8 GB of RAM for up to 3 players, and we'd run it on Java 17.
A huge, long-running expert pack on Forge 1.7.10 where every recipe goes through GregTech, with a questbook of over 3,000 quests to guide you.
Pack details checked by hand against GregTech: New Horizons on CurseForge on October 4, 2026.
GregTech: New Horizons is a Forge modpack for Minecraft 1.7.10 with 231 mods, 209 of which run on the server. We'd run its latest version on Java 17 and our Heavy plan with 12 GB of RAM.
- The GTNH version (for example 2.8.4) must match exactly between the server and every player, but players may use either the Java 8 or the Java 17+ client.
- A 2.9.0 release candidate came out the day we checked. This guide is for the stable 2.8.4; wait for the full 2.9.0 release before updating a server you care about.
Quick facts
| Loader | Forge |
|---|---|
| Minecraft versions | 1.7.10 |
| Java needed | Java 17 for Minecraft 1.7.10GT New Horizons publishes two server zips, one for Java 8 and one for Java 17 to 25; use the Java 17 to 25 zip with Java 17, which GTNH's wiki calls the most widely tested. Java version chart. |
| Mods | 209 run on the server231 in the pack. The other 22 are client-only, and the server skips them. Counted from GTNH's release manifest for version 2.8.4 on GitHub. |
| RAM | About 6–8 GB for 1–3 playersBy player count. |
| Downloads | 1,783,588 on CurseForgeAs of October 4, 2026. |
| Latest version | January 11, 2026 (version 2.8.4)The newest version when we checked on October 4, 2026. |
| Official server files | Download pageServer zips for Java 17 to 25 and for Java 8 are on GT New Horizons' own downloads page. |
| Authors' RAM advice | GTNH's wiki asks for 6 GB plus 0.5 GB per extra player early on, and 6 GB plus 1 GB per extra player from the UV tier on.Source |
| Where to get it | GregTech: New Horizons on CurseForge |
| Tags | exploration, tech, magic, quests |
GTNH on a server: what to know
GregTech: New Horizons runs on Minecraft 1.7.10, and its wiki says a dedicated server is the only way for several players to share one world, because the quest book doesn't support LAN. Download server files only from gtnewhorizons.com: 2.8.4 comes as a Java 8 zip and a Java 17-25 zip, the wiki strongly recommends Java 17 or newer, and the zip has to match the server's Java. The Java 17+ start script launches lwjgl3ify-forgePatches.jar with java9args.txt and a fixed 6 GB heap (-Xms6G -Xmx6G).
The server files ship with white-list=true, so add players with whitelist add <name>, and level-type=rwg, which the wiki says to keep. serverutilities.cfg also ships with chunk_claiming=false, which leaves chunk claiming and chunk loading off until you enable it.
Watch out for
- ServerUtilities backs up every 30 minutes while players are online and keeps 12 copies in ./backups; the wiki warns that running out of disk space can corrupt the world. Source.
- When updating, keep config/JourneyMapServer from your old files: it holds the world's map ID, and losing it costs players their JourneyMap data for the server. Source.
Sources: wiki.gtnewhorizons.com, gtnewhorizons.com, downloads.gtnewhorizons.com. Checked October 12, 2026.
GTNH server files
GTNH's authors publish official server files. Server zips for Java 17 to 25 and for Java 8 are on GT New Horizons' own downloads page. Get the official server files.
Use the server files for the exact version your players install: a server and client on different pack versions won't connect. Download the server zip for Java 17 to 25 from GT New Horizons' downloads page, unzip it and upload the contents over SFTP, then follow the GTNH wiki's server setup page for the start files.
How much RAM does a GTNH server need?
| Players online | RAM | DSN plan |
|---|---|---|
| 1–3 players | About 6–8 GB | Premium (8 GB) |
| 4–8 players | About 7.5–13 GB | Heavy (12 GB) at the low end of the rangeMore than 12 GB at the high end. |
| 9–15 players | About 10–20 GB | Heavy (12 GB) at the low end of the rangeMore than 12 GB at the high end. |
These follow the authors' own advice, from the fewest players in each row to the most. GTNH's wiki asks for 6 GB plus 0.5 GB per extra player early on, and 6 GB plus 1 GB per extra player from the UV tier on. The low end uses their smaller figure per extra player, the high end the bigger one.
By this estimate Premium (8 GB) can run a small group. Our pick below, Heavy, leaves room for more players and for the pack growing with updates.
With 4–8 players, GTNH can need more than 12 GB, our biggest plan. A lower view distance and a pre-generated world help it fit; past that, a host with bigger plans is the better choice.
Set Java's heap (-Xmx) 10–15% under the RAM you have, about -Xmx10500M on 12 GB. Forge 1.7.10 takes it in the java command (-Xmx), usually in the start script. RAM guide.
GTNH server requirements
| Java | Java 17GT New Horizons publishes two server zips, one for Java 8 and one for Java 17 to 25; use the Java 17 to 25 zip with Java 17, which GTNH's wiki calls the most widely tested. |
|---|---|
| Loader | Forge for Minecraft 1.7.10 |
| CPU | Fast single-core speed (one main thread). With 209 mods, the first start takes minutes. |
| RAM | About 6–20 GB for 1–15 players (table above) |
| Disk | The server files, a growing world and backups |
| Network | TCP port 25565 open to players |
Recommended plan
Our pick for GTNH
Heavy
12 GB RAM · planned launch price $42/month
GTNH's wiki asks for 6 GB plus up to 1 GB per extra player, so 12 GB covers a group of friends into the late game.
Ordering is closed until we relaunch. We aren't taking orders or payments while we move to new hardware. Join the launch list and we'll email you when Heavy servers open.
Heavy is our biggest plan. Not sure? Email hello@dsnservers.com.
Planned launch price in USD, billed monthly once ordering opens, with a 7-day refund window.
How to make a GTNH server on your own PC
What's specific to GTNH, step by step. The full walkthrough for any pack: how to make a modded Minecraft server.
- Install Java 17.
Check with
java -version. GT New Horizons publishes two server zips, one for Java 8 and one for Java 17 to 25; use the Java 17 to 25 zip with Java 17, which GTNH's wiki calls the most widely tested. Java version chart. - Get the server files.
Download the official server files for the version your players use and unzip them into an empty folder. Follow the readme that comes with them.
- Start it and accept the EULA.
Run the start script in the server files, or
java -jaron the Forge jar the installer made, then seteula=trueineula.txtif you accept Mojang's EULA (EULA step). With 209 mods, the first start takes minutes. - Set the RAM with
-Xmx, sized from the table above. - Let friends connect: forward TCP 25565, or use a tunnel or host behind CGNAT (can't connect?).
Or run GTNH on DSN
Once we relaunch (join the launch list), on DSN you'd set it up by hand, with the panel doing the Java and the address: Download the server zip for Java 17 to 25 from GT New Horizons' downloads page, unzip it and upload the contents over SFTP, then follow the GTNH wiki's server setup page for the start files.
How to play GTNH with friends
Each player installs GTNH with the CurseForge app or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.
Different versions of GTNH on the server and a client show up as Mismatched mod channel list or mod rejections. Why friends can't join, timeouts included.
Lag and performance on GTNH
Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once GTNH has enough (tick lag guide). For GTNH:
- Distances:
view-distance=8inserver.properties. - Pre-generate: with a pregeneration mod built for 1.7.10, before people explore.
- Chunk loaders keep machines running with nobody nearby; in a pack this size, dozens add up.
Common GTNH crashes
What a Forge 1.7.10 server running GTNH hits most. For any other error, paste the log into the free crash log analyzer.
- Out of memory. GTNH (209 mods) needs about 6–8 GB for 1–3 players;
java.lang.OutOfMemoryErrormeans it ran out. Out-of-memory fix. - Wrong Java version. GT New Horizons publishes two server zips, one for Java 8 and one for Java 17 to 25; use the Java 17 to 25 zip with Java 17, which GTNH's wiki calls the most widely tested. Set the server's Java to match. Java version fix.
- Client-only mod on the server. GTNH includes 22 client-only mods, which a server install skips; copying a player's mods folder brings them back and stops the server. Check a mods list with the client-or-server-side checker. Client-only mod fix.
- After adding or updating a mod. Mods you add to GTNH by hand usually crash it with a missing dependency:
cpw.mods.fml.common.MissingModsExceptionnames the mod. - Ticking entity or block entity. The crash report names it and gives its coordinates. Ticking entity fix.
Updates and support
Before moving GTNH past version 2.8.4, back up the world: see updating a modpack server without losing your world.
Bugs in GTNH itself go to its authors: issue tracker and wiki. Server problems on DSN: hello@dsnservers.com or Discord.
Packs like GTNH
More: all modpack guides and how to make a modded server.
Run GTNH on DSN when we relaunch.
Our pick, Heavy: 12 GB, planned at $42/month.
DSN Servers isn't affiliated with GregTech: New Horizons or CurseForge. We wrote the summary and checked the pack's facts by hand on October 4, 2026. Sources: curseforge.com, api.cfwidget.com, wiki.gtnewhorizons.com, gtnewhorizons.com, raw.githubusercontent.com, curseforge.com (2).