If you're setting up a modded Minecraft server, the #1 question is always "how much RAM do I need?" Too little and your server chugs at 5 TPS. Too much and you're burning money on idle resources you'll never touch.
Here are the straight numbers for every major modpack in 2026 — tested on real hardware, not guesswork.
RAM Requirements by Modpack
These numbers assume a server running Paper or Purpur with 5–10 concurrent players. Add 1–2 GB for every additional 10 players.
| Modpack | Min RAM | Recommended | Players (rec.) |
|---|---|---|---|
| Vanilla / Paper (plugins only) | 2 GB | 4 GB | 20+ |
| Create | 4 GB | 6 GB | 10–15 |
| Pixelmon | 4 GB | 8 GB | 10–15 |
| Vault Hunters 3 | 6 GB | 10 GB | 5–10 |
| Better MC (BMC4) | 6 GB | 8 GB | 8–12 |
| RLCraft | 5 GB | 8 GB | 5–10 |
| FTB Direwolf20 | 6 GB | 10 GB | 5–10 |
| All the Mods 10 (ATM10) | 8 GB | 12–16 GB | 5–10 |
| GregTech Community Pack | 8 GB | 16 GB | 3–6 |
| Enigmatica 10 | 8 GB | 12 GB | 5–8 |
The Quick Rule
4 GB for light mods (Create, Tinkers'). 8 GB for most kitchen-sink packs. 12–16 GB for heavy packs (ATM10, GregTech). Beyond 16 GB is almost never about the Minecraft server itself — it's for convergence, SSDs, or running multiple servers on one machine.
RAM Isn't Everything — CPU Matters More Than You Think
Minecraft is single-thread bound. A Ryzen 9 with high clock speed at 6 GB will outperform a Xeon at 16 GB for almost every modpack. The server's tick loop (TPS) depends on single-core IPC far more than total RAM. Always prioritize CPU generation over raw memory.
At Revitalize, every game node runs modern AMD Ryzen processors with high single-clock boost — not repurposed server Xeons. You can see the exact hardware on our pricing page.
JVM Flags That Actually Help
Don't use default JVM args. These Aikar-optimized flags are the community standard and reduce GC stutter significantly:
-Xms6G -Xmx6G -XX:+UseG1GC -XX:+ParallelRefProcEnabled
-XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions
-XX:+DisableExplicitGC -XX:+AlwaysPreTouch
-XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4
-XX:G1MixedGCLiveThresholdPercent=90
-XX:G1RSetUpdatingPauseTimePercent=5
-XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem
-XX:MaxTenuringThreshold=1 -XX:G1NewSizePercent=30
-XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M
-XX:G1ReservePercent=20 -XX:InitiatingHeapOccupancyPercent=15
-Dusing.aikars.flags=mcflags.emc.gs
-Dfile.encoding=UTF-8Set -Xms and -Xmx to the same value (equal to your allocated RAM). Our custom panel actually includes a built-in Java flags tuner with these presets so you don't have to paste them manually.
Storage Speed Is the Hidden Bottleneck
Modded servers hammer the disk during chunk generation, especially with terrain mods like Biomes O' Plenty or Terralith. NVMe vs SATA SSD is the difference between 30-second world loads and 3-minute ones. Avoid spinning rust entirely. Every Revitalize server uses NVMe storage — no exceptions, no "SSD cache" tiers.
How Player Count Changes the Math
Each additional player adds roughly 100–200 MB of RAM usage on a modded server (more if they're exploring new chunks). For a heavy modpack like ATM10:
- 1–5 players: 8 GB
- 5–10 players: 12 GB
- 10–20 players: 16 GB
- 20+ players: 16 GB + dedicated CPU core
If you're running a public server with 20+ concurrent, you need to upgrade your CPU allocation too — not just RAM. Our VPE (Virtual Pulse Environment) lets you resize both independently in the panel without opening a ticket.
Need a server with the exact specs your modpack needs?
Use our server builder — pick RAM, CPU cores, and NVMe storage. No rigid tiers. No upsells.
Build Your Server →Frequently Asked Questions
Can I run a modded server on 2 GB of RAM?
Only for tiny modpacks (under 50 mods) with 1–2 players. Anything beyond that will hit garbage collection pauses and TPS drops immediately.
Is 16 GB of RAM overkill for a Minecraft server?
For vanilla or lightly modded, yes. For ATM10, GregTech, or Enigmatica with 10+ players, 16 GB is the recommended baseline.
Does more RAM mean better performance?
Up to a point. Once you have enough RAM to avoid GC pressure, adding more doesn't improve TPS. CPU clock speed becomes the bottleneck.
Should I use Windows or Linux for a modded Minecraft server?
Linux (Ubuntu/Debian) uses less overhead and handles GC better. Windows can add 500 MB–1 GB of background RAM usage that your server won't have access to.
What happens if I run out of RAM on my server?
The server hitches, TPS drops to single digits, and eventually the JVM throws an OutOfMemoryError and crashes. Watch your memory usage — our Pulse monitoring sends alerts if you're approaching your limit.