Minecraft has become significantly more demanding over the years. Modern versions, large modpacks, higher render distances, shaders, and multiplayer worlds can push the game beyond the default memory settings.

If you are experiencing:

• Minecraft lag spikes

• Chunk loading delays

• Stuttering gameplay

• "Out of memory" crashes

• Prism Launcher not enough RAM errors

the problem may be that Minecraft does not have enough allocated memory.

By default, Minecraft Java Edition usually starts with around 2GB of RAM allocation, which is enough for basic vanilla gameplay but often insufficient for modded Minecraft or large worlds.

The solution is simple: increase Minecraft's RAM allocation through your launcher settings.

This guide explains how to allocate more RAM to Minecraft in:

• Official Minecraft Launcher

• Prism Launcher

• CurseForge Launcher

It also explains how much RAM Minecraft actually needs, how to fix "not enough RAM" errors, and the best memory settings for modpacks and servers in 2026.

Quick Answer: How Much RAM Does Minecraft Need?

The amount of RAM Minecraft needs depends on how you play the game.

Minecraft Usage	Recommended RAM Allocation
Vanilla Minecraft	2GB–4GB
Multiplayer Survival	3GB–5GB
Small Modpacks (10–50 mods)	4GB–6GB
Large Modpacks (100+ mods)	6GB–10GB
Heavy Modpacks (All The Mods, RLCraft, Better MC)	8GB–12GB
Minecraft Servers	4GB–10GB

For most players, 4GB to 8GB of allocated RAM is the ideal range.

Giving Minecraft more RAM does not automatically increase FPS. Instead, additional memory helps:

• Reduce memory-related crashes

• Improve chunk loading stability

• Prevent lag spikes

• Support larger modpacks

How Much RAM Does Minecraft Need in 2026?

Minecraft RAM requirements depend more on your gameplay style than the exact game version.

Newer Minecraft versions, including 2026 releases such as Minecraft 26.2, may include performance improvements and additional content, but the required RAM is still mainly determined by:

• Number of mods installed

• Render distance

• Texture packs

• Shaders

• World size

• Multiplayer activity

Vanilla Minecraft RAM Requirements

For a standard Minecraft Java Edition world without mods:

• 2GB RAM: Minimum playable allocation

• 4GB RAM: Recommended for smooth gameplay

Most vanilla players do not need more than 4GB.

Minecraft Modpack RAM Requirements

Modded Minecraft uses significantly more memory because modpacks add:

• New blocks

• Additional creatures

• Expanded world generation

• Complex machines

• Custom textures

Recommended settings:

Modpack Size	Recommended RAM
20–50 mods	4GB–6GB
50–150 mods	6GB–8GB
150+ mods	8GB–12GB

Popular modpacks such as:

• All The Mods

• RLCraft

• Better Minecraft

often require more RAM than vanilla Minecraft.

⚠️ Do Not Allocate Too Much RAM to Minecraft

More RAM is not always better.

Minecraft Java Edition uses Java Garbage Collection to manage memory. If you allocate an excessive amount of RAM, Java may spend more time cleaning unused memory, which can actually create additional stuttering.

For example:

A basic vanilla Minecraft installation does not benefit from 16GB RAM allocation.

A better configuration:

System RAM	Recommended Minecraft RAM
8GB PC	3GB–4GB
16GB PC	6GB–8GB
32GB PC	8GB–12GB

A good rule:

Allocate around 50% of your system RAM to Minecraft at most, while leaving enough memory for Windows and background applications.

How to Check Your PC's Total RAM

Before increasing Minecraft memory allocation, check how much RAM your computer has.

Windows

1. Right-click the Start button

2. Open Task Manager

3. Select Performance

4. Click Memory

Your installed RAM will be shown in the top-right corner.

macOS

1. Click the Apple menu

2. Select About This Mac

3. Check the Memory section

How to Allocate More RAM to Minecraft

Minecraft RAM allocation depends on the launcher you use.

The main settings are controlled through Java arguments, especially:

-Xmx

The -Xmx value controls the maximum amount of memory Minecraft can use.

Examples:

-Xmx4G

means Minecraft can use up to 4GB RAM.

-Xmx8G

means Minecraft can use up to 8GB RAM.

A. Official Minecraft Launcher

If you use the default Minecraft Launcher from Mojang/Microsoft, follow these steps:

Step 1: Open Installations

Launch Minecraft Launcher.

Select:

Installations

Find the Minecraft version you want to modify.

Step 2: Edit Java Arguments

Click:

⋯ → Edit → More Options

Find the JVM Arguments box.

You will see something similar to:

-Xmx2G

Change it to your preferred memory amount.

Examples:

For 4GB:

-Xmx4G

For 8GB:

-Xmx8G

Step 3: Save Settings

Click:

Save

Restart Minecraft completely.

Your new RAM allocation will apply the next time the game launches.

B. How to Allocate More RAM in Prism Launcher

Prism Launcher is one of the most popular Minecraft launchers for advanced users because it provides detailed control over Java settings, instances, and modpacks.

If you are searching for "how to increase RAM in Prism Launcher" or seeing a "not enough RAM Prism Launcher" error, adjusting the maximum memory allocation is usually the first solution.

Step 1: Open Prism Launcher Settings

Launch Prism Launcher.

From the top menu, select:

Settings → Java

Step 2: Change Maximum Memory Allocation

Find:

Maximum memory allocation

This value is displayed in MB.

Common Minecraft RAM settings:

Your PC RAM	Recommended Minecraft Allocation
8GB RAM	3072MB–4096MB
16GB RAM	6144MB–8192MB
32GB RAM	8192MB–12288MB
64GB RAM	12288MB–16384MB

Remember:

4096MB = 4GB
8192MB = 8GB
12288MB = 12GB

For example, if you have a 16GB RAM computer and run a large Forge modpack, setting:

8192MB

is usually a good starting point.

Step 3: Apply Settings and Restart Minecraft

After changing the memory value:

1. Close Prism Launcher settings

2. Restart Minecraft

3. Load your world or modpack again

Prism Launcher applies the new RAM allocation when Java starts.

How to Fix "Not Enough RAM" Errors in Prism Launcher

If Prism Launcher shows that Minecraft does not have enough memory, increasing RAM allocation may solve the issue.

However, several different problems can cause this error.

1. Minecraft Has Too Little Allocated Memory

Many Minecraft installations start with a low memory limit.

For example:

-Xmx2048M

means Minecraft can only use 2GB RAM.

For modded Minecraft, increase this to:

-Xmx6G

or:

-Xmx8G

2. Your Computer Does Not Have Enough Available RAM

Minecraft cannot use RAM that is already occupied by Windows or other applications.

Example:

A computer with 8GB system RAM:

Usage	Memory
Windows	3GB–4GB
Minecraft	4GB
Browser and background apps	Remaining memory

In this situation, allocating too much RAM may actually cause:

• Freezing

• Crashes

• Slow loading

• System swapping

3. Wrong Java Version

Minecraft Java Edition depends on Java versions.

Common requirements:

Minecraft Version	Recommended Java
Minecraft 1.20	Java 17
Minecraft 1.21	Java 21
Newer releases	Check official requirements

If Minecraft fails to launch after changing RAM settings, verify that Prism Launcher is using the correct Java installation.

C. How to Allocate More RAM in CurseForge Launcher

CurseForge is widely used for Minecraft modpacks because it automatically manages mods and profiles.

To increase Minecraft RAM in CurseForge:

Step 1: Open CurseForge Settings

Open the CurseForge application.

Click:

Settings → Minecraft

Step 2: Find Allocated Memory

Scroll to:

Java Settings

Find:

Allocated Memory

Adjust the slider.

Examples:

Memory	Value
4GB	4096MB
6GB	6144MB
8GB	8192MB

Step 3: Restart the Modpack

Close Minecraft completely and launch the modpack again.

The new RAM allocation will now apply.

Best Minecraft RAM Settings for Modpacks

Large Minecraft modpacks are usually the main reason players need more RAM.

Allocating too little memory can cause:

• Long startup times

• Loading screen freezes

• Crashes while exploring

• Chunk generation lag

Recommended settings:

Modpack Type	RAM Allocation
Small modpacks	4GB–6GB
Medium modpacks	6GB–8GB
Large modpacks	8GB–10GB
Extreme modpacks	10GB–12GB

Examples:

Modpack	Recommended RAM
Better Minecraft	6GB–8GB
RLCraft	6GB–8GB
All The Mods	8GB–12GB

Does More RAM Increase Minecraft FPS?

A common misconception is:

More allocated RAM automatically gives higher FPS.

This is not usually true.

Increasing Minecraft RAM mainly improves:

✅ Stability
✅ Chunk loading
✅ Modpack performance
✅ Reducing memory crashes

It does not directly improve:

❌ GPU rendering performance
❌ CPU processing speed
❌ Shader performance

If you want higher FPS, focus on:

• Better GPU

• Faster CPU

• Lower render distance

• Performance mods such as Sodium or similar optimization tools

How to Allocate RAM for a Minecraft Server

Minecraft servers use RAM differently from the client game.

Servers do not render graphics, but they manage:

• Player data

• World generation

• Entities

• Plugins

• Mods

Vanilla Minecraft Servers

For small servers:

Players	Recommended RAM
1–5 players	2GB–4GB
5–10 players	4GB–6GB
10+ players	6GB+

Modded Minecraft Servers

Modded servers require significantly more memory.

Recommended:

Server Type	RAM
Small modded server	6GB
Large modpack server	8GB–12GB

A general guideline:

2GB base memory + 200MB per player

Changing Server RAM Allocation

Minecraft servers use JVM arguments.

Open:

start.bat

on Windows, or:

start.sh

on Linux.

Find:

-Xms
-Xmx

Example:

-Xms2G -Xmx6G

This means:

• Starting memory: 2GB

• Maximum memory: 6GB

How to Verify Your Minecraft RAM Allocation

After changing Minecraft memory settings, you should verify that the new allocation is actually applied.

Simply changing the launcher setting does not guarantee that Minecraft is using the correct amount of RAM.

Follow these steps:

Step 1: Launch Minecraft

Start Minecraft using your updated profile, launcher, or modpack.

Load into:

• A single-player world

• A multiplayer server

• Your modded instance

Step 2: Open the Debug Screen

Press:

F3

On some laptops, you may need:

Fn + F3

The debug screen will appear.

Step 3: Check Memory Usage

Look at the top-right corner.

You will see something similar to:

Mem: 24% 1950/8192MB

The second number represents the maximum memory available.

Example:

1950/8192MB

means Minecraft has access to:

8192MB = 8GB RAM

If this matches your setting, the RAM allocation was successful.

Troubleshooting Minecraft RAM Problems

Why Won't Minecraft Launch After Allocating More RAM?

If Minecraft stops launching after increasing RAM allocation, check these common problems:

1. You Allocated More RAM Than Your PC Has Available

Example:

Your computer:

8GB RAM

You allocate:

-Xmx8G

This leaves almost no memory for:

• Windows

• Java processes

• Background applications

Result:

• Crashes

• Freezing

• Failed launches

Solution:

Reduce allocation to:

-Xmx4G

2. The JVM Argument Is Incorrect

A common mistake is modifying the wrong part of the argument.

Correct:

-Xmx8G

Incorrect:

-Xmx 8G

or:

Xmx8G

The formatting must remain exactly:

-Xmx[number]G

3. Java Installation Problems

Minecraft Java Edition depends on Java.

If RAM changes cause launch problems:

Check:

• Java version

• Java path

• Launcher settings

Prism Launcher users can verify this under:

Settings → Java

Frequently Asked Questions

How much RAM should I allocate to Minecraft?

For most players, 4GB to 8GB of RAM is the ideal allocation.

Use:

• 2GB–4GB for vanilla Minecraft

• 4GB–6GB for small modpacks

• 8GB–12GB for large modpacks

Avoid allocating more RAM than necessary because Java garbage collection can cause additional stuttering.

Is 8GB RAM enough for Minecraft?

Yes, 8GB of system RAM is enough for vanilla Minecraft and smaller modpacks.

However, if you run large modpacks such as All The Mods or RLCraft, 16GB of total system RAM is recommended.

Is 16GB RAM enough for Minecraft modpacks?

Yes.

A 16GB RAM computer can comfortably run:

• Vanilla Minecraft

• Most Forge/Fabric modpacks

• Multiplayer worlds

Recommended allocation:

6GB-8GB Minecraft RAM

while leaving memory available for Windows.

Does allocating more RAM increase FPS in Minecraft?

No.

More RAM does not directly increase FPS.

It mainly helps with:

• Reducing stuttering

• Preventing crashes

• Improving modpack stability

• Faster chunk loading

For higher FPS, upgrade:

• CPU

• GPU

• Cooling

• Graphics settings

Why does Prism Launcher say "Not Enough RAM"?

Prism Launcher usually shows this error because:

1. Minecraft has insufficient allocated memory

2. Your computer does not have enough free RAM

3. Java settings are incorrect

4. A large modpack requires more memory

Try increasing the maximum memory setting under:

Settings → Java → Maximum Memory

What does -Xmx mean in Minecraft?

-Xmx controls the maximum amount of RAM Java can use.

Examples:

-Xmx4G

allows Minecraft to use up to 4GB RAM.

-Xmx8G

allows Minecraft to use up to 8GB RAM.

It is the main setting used to allocate more RAM in Minecraft launchers.

Why does Minecraft use MB instead of GB?

Some launchers display memory in megabytes.

The conversion is:

1GB = 1024MB

Examples:

GB	MB
2GB	2048MB
4GB	4096MB
6GB	6144MB
8GB	8192MB

Conclusion

Allocating more RAM to Minecraft is one of the easiest ways to improve stability, especially when playing modpacks, using Prism Launcher, or running Minecraft servers.

The ideal settings depend on your system:

• Vanilla Minecraft: 2GB–4GB

• Most players: 4GB–8GB

• Heavy modpacks: 8GB–12GB

Remember the key rules:

1. Increase RAM through your launcher settings

2. Do not allocate more memory than your PC can spare

3. Leave enough RAM for Windows and background applications

4. More RAM improves stability, but does not automatically increase FPS

Whether you use the official Minecraft Launcher, CurseForge, or Prism Launcher, the right RAM allocation can make Minecraft smoother and prevent many common memory-related issues.