All The Mods 9 Server Hosting Guide (ATM9)

So you wanna host an All The Mods 9 server. Smart choice - ATM9 is one of the most popular modpacks right now with like 400+ mods. But it's also HEAVY and most cheap hosts can't handle it properly.

Let me show you exactly what you need to run ATM9 smoothly without lag or crashes.

What is All The Mods 9?

ATM9 is a kitchen sink modpack - basically has every popular mod crammed into one pack:

• Tech mods (Mekanism, Industrial Foregoing, etc)
• Magic mods (Ars Nouveau, Occultism)
• Exploration (Alex's Mobs, Biomes O' Plenty)
• Building (Chisel, FramedBlocks)
• Performance mods (thankfully)

It's massive. Over 400 mods. Runs on Minecraft 1.20.1. And it NEEDS proper hosting to work right.

RAM Requirements (The Real Numbers)

Everyone asks "how much RAM do I need?"

Here's the truth based on actual testing:

For 1-5 players: 10GB minimum

• 12GB recommended
• You'll use about 8-9GB consistently
• Spikes to 10GB+ during chunk generation

For 6-10 players: 12-14GB minimum

• 16GB recommended if people explore a lot
• Chunk loading and automation adds up fast

For 11-20 players: 16-20GB minimum

• 20GB+ if you run multiple dimensions actively
• More players = more loaded chunks = more RAM

Don't believe hosts that say "4GB is enough for ATM9" - it's not. You'll crash constantly.

CPU Requirements

Minecraft is single-threaded so you need FAST cores not many cores.

What works well:

• AMD Ryzen 9 (3.8GHz+)
• Intel i9 or high-end Xeon
• Anything with 4.0GHz+ single core boost

What doesn't work:

• Old Xeons with like 2.4GHz (even if 16 cores)
• Budget CPUs
• Anything that doesn't list clock speeds (red flag)

ATM9 has hundreds of mods doing calculations every tick. Slow CPU = lag.

Storage - SSD is Mandatory

NVMe SSD: Perfect, use this

• Server starts in 2-3 minutes
• Chunk loading is instant
• No lag spikes

SATA SSD: Okay, but slower

• Server start time 4-6 minutes
• Some chunk loading delays

HDD: Don't even try

• Server takes 10+ minutes to start
• Constant lag when generating chunks
• Absolutely terrible experience

ATM9 loads hundreds of mods and thousands of files. HDD will make you want to quit.

Best Hosting for ATM9

After testing like 5 different hosts, here's what actually works:

Space-Node - Best Performance

Recommended plan: Diamond (10GB) for €9/month

Specs:

• AMD Ryzen 9 CPU (perfect for ATM9)
• 10GB dedicated RAM
• 100GB NVMe SSD
• Full VPS access

Performance:

• Server start: 2min 45sec
• TPS: Constant 19.8-20 (perfect)
• Chunk generation: No lag
• Players: Handles 10-15 easily

Why it works:

• Fast CPU handles mod calculations
• Dedicated RAM (not shared)
• NVMe makes loading super fast
• Support helps with JVM optimization

I run my ATM9 server here. Zero crashes in 3 months. TPS never drops.

Cost breakdown:

• 1-5 players: Diamond plan (€9/month) perfect
• 6-10 players: VPS-S (€12.99/month for 12GB)
• 10+ players: VPS-M (€23.99/month for 16GB)

What About Cheaper Options?

Look, you CAN find cheaper hosting. But here's what happens:

€5/month "budget" hosting:

• Shared CPU and RAM
• Constant TPS drops to 15-17
• Crashes when chunk generating
• Players complain about lag
• You waste time troubleshooting

€9/month Space-Node:

• Dedicated resources
• TPS stays at 20
• Zero crashes
• Players have fun
• You actually enjoy hosting

The €4 difference isn't worth the frustration.

Server Setup Guide

Here's how to actually set up ATM9 on your host:

Step 1: Download ATM9 Server Files

Go to CurseForge and download the ATM9 server files (not client):

• Get the latest version
• Download the .zip file
• Extract it on your computer first to see what's inside

Step 2: Upload to Your Server

Use an FTP client (FileZilla is free):

1. Connect to your server
2. Upload ALL the ATM9 files
3. Make sure server.jar is there
4. Upload the mods, config, and defaultconfigs folders

This takes like 10-15 minutes depending on your internet.

Step 3: Allocate RAM Properly

Edit your startup script or panel settings:

For 10GB server, use:

-Xms10G -Xmx10G

Don't do -Xms2G -Xmx10G or other weird splits. Keep them the same.

Step 4: Use Optimized JVM Arguments

Space-Node support gave me these arguments and they work perfectly:

java -Xms10G -Xmx10G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true -jar server.jar nogui

These reduce GC pause times from like 500ms to 50ms. Huge difference.

Step 5: Start and Test

1. Start your server
2. Wait for it to fully load (watch console)
3. Join with your ATM9 client
4. Test chunk generation
5. Check TPS with /forge tps

If TPS is under 19, something's wrong with your hosting.

Common ATM9 Server Issues

"Server keeps running out of memory"

Your plan doesn't have enough RAM. ATM9 needs at minimum 10GB.

Upgrade to larger plan or remove some mods (not recommended, breaks progression).

"TPS drops to 15 when exploring"

Either your CPU is too slow or you're on shared resources.

This is why dedicated resources matter. Shared hosting can't handle ATM9 chunk generation.

"Server takes 10 minutes to start"

You're on HDD not SSD. Or your host has slow storage.

Get NVMe SSD hosting. Makes server start 5x faster.

"Random crashes every few hours"

Usually memory leaks from specific mods or bad JVM arguments.

Use the optimized arguments I posted above. If still crashing, check crash logs for specific mods.

Optimization Tips

Pre-generate Your World

Use Chunky mod to pre-gen like a 5000x5000 area:

/chunky world <worldname>
/chunky radius 2500
/chunky start

Let it run overnight. Saves SO much lag later.

Set View Distance Properly

In server.properties:

view-distance=8
simulation-distance=6

Don't go higher unless you have 16GB+ RAM.

Use ServerCore Mod

ATM9 includes it but make sure these configs are set:

• Dynamic view distance: enabled
• Entity activation range: optimized
• Teleport chunk loading: disabled

Regular Restarts

Restart your server every 12-24 hours to clear memory leaks:

• Set up automatic restart schedule
• Warn players 5 min before
• Keeps server fresh

Player Count Guide

How many players can your server handle?

10GB RAM (Diamond plan):

• 5-10 players: Perfect
• 10-15 players: Good if they don't all explore at once
• 15+ players: Will struggle

12GB RAM (VPS-S):

• 10-15 players: Perfect
• 15-20 players: Good
• 20+ players: Struggles

16GB RAM (VPS-M):

• 15-20 players: Perfect
• 20-30 players: Good
• 30+ players: Need more RAM

These assume normal gameplay. If everyone's building massive automation, you'll need more.

Cost Comparison

Let me show you real hosting costs for ATM9:

Space-Node Diamond (€9/month):

• 10GB RAM
• Perfect for 10 players
• €0.90 per player
• Zero lag

Random "cheap" host (€6/month):

• "8GB" shared RAM
• Laggy for 5 players
• €1.20 per player (because you can host less)
• Constant frustration

See? The "cheaper" host actually costs MORE per player because performance sucks.

My Honest Recommendation

If you're serious about hosting ATM9:

For small group (5-8 friends): Get Space-Node Diamond for €9/month. It's perfect for this size and you'll have zero issues.

For community server (10-15 players): Get Space-Node VPS-S for €12.99/month. The extra RAM helps during peak times.

For public server (20+ players): Get Space-Node VPS-M (16GB) for €23.99/month. You need the resources for that many players.

Don't try to cheap out on ATM9 hosting. The modpack is too heavy. You'll just frustrate yourself and your players.

Check out Space-Node's Minecraft plans - they have everything from small servers to massive setups.

Or if you want to run multiple servers (like ATM9 + vanilla), get a VPS plan and run both on one VPS.

Final Tips

• Backups: Set up automatic backups daily
• Whitelist: Use whitelist for stability
• Rules: Ban quarries and other lag-heavy automation
• Monitoring: Watch TPS and RAM usage regularly
• Updates: Keep ATM9 updated but test first

ATM9 is an amazing modpack but it needs proper hosting. Don't settle for laggy servers when €9/month gets you perfect performance.

Your players will actually thank you for spending the extra few euros on good hosting instead of dealing with constant crashes.