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How to Allocate More RAM to Minecraft Launchers

Having sufficient RAM for various versions of Minecraft both vanilla and modded is important for the game’s performance and for preventing client-side game crashes. In this article, we’ll go over how to allocate more RAM to some of the most commonly used Launchers.

Minecraft Launcher

  1. Open the Launcher and verify you’re on the Java Edition section of the launcher.

  2. Click on the installations tab and find which installation you want to allocate more RAM to.Accessing the installations tab in the Minecraft Launcher

  3. Hover over the installation you want to allocate more RAM to and click on the more options (3-dot menu) and click on edit.

    Accessing the installation settings in the Minecraft Launcher

  4. Click on the More Options text.

    Accessing additional options in the Minecraft Launcher

  5. Change the number after the argument -Xmx to allocate more RAM. (i.e. -Xmx1G = 1GB of RAM, -Xmx6G = 6GB of RAM etc.)

    Changing the amount of allocated memory in the Minecraft Launcher

ATLauncher

ATLauncher has two different ways to allocate RAM. The first way being the way to set the default RAM for all instances. The second is to set the RAM for an individual instance.

Setting the Default RAM Allocation for All Instances

  1. Click on Settings on the sidebar.

  2. Click the Java/Minecraft tab.

    ATLauncher Settings Java/Minecraft specific settings page

  3. Change the Maximum Memory/Ram option to allocate more RAM as the default for all ATLauncher instances. Note that this option is in Megabytes, a Gigabyte is approximately 1024 Megabytes (i.e. 1GB = 1024MB, 4GB = 4096MB, etc.)

    Allocating more RAM within the ATLauncher Java/Minecraft settings

Allocating RAM to an Individual Instance

  1. Click on “Instances” in the sidebar.

  2. Click on the settings button for the instance you want to allocate more RAM to.

    Accessing instance specific settings within ATLauncher

  3. Click on the Java/Minecraft Settings tab.

  4. Change the Maximum Memory/Ram option to allocate more RAM as the default for all ATLauncher instances. Note that this option is in Megabytes, a Gigabyte is approximately 1024 Megabytes. (i.e. 1GB = 1024MB, 4GB = 4096MB etc.)

    Allocating RAM within ATLauncher Java/Minecraft settings on a specific instance

CurseForge App

Curseforge also has two different ways of allocating RAM. The first way would be to set the default RAM for the launcher as a general setting that applies to all profiles unless overridden by individual profile settings. The second would be to set the RAM for a specific profile in the profile settings

Allocating RAM in the General Settings

  1. Click the gear icon in the lower left to open the settings.

    Accessing the general CurseForge launcher settings

  2. In the settings menu click on Minecraft under Game Specific Settings.

  3. Scroll down to find the Allocated Memory slider under the Java Settings.

  4. Move the Slider to allocate RAM. The slider is in megabytes, a gigabyte is approximately 1024 megabytes. (i.e. 1GB = 1024MB, 4GB = 4096MB etc.)

    Setting the default memory allocation in the CurseForge launcher

Allocating more RAM to a Specific Profile

  1. Go to the My Modpacks section of the CurseForge launcher.

  2. Click on anywhere on the profile tile you want to select except for the play button.

    Accessing the profile page in the CurseForge launcher

  3. Open the 3-dot options menu next to the play button and click on “Profile Options”.

    Accessing the profile specific options in the CurseForge launcher

  4. Uncheck the use system memory settings box.

  5. Move the Slider to allocate RAM. The slider is in megabytes, a gigabyte is approximately 1024 megabytes. (i.e. 1GB = 1024MB, 4GB = 4096MB etc.)

    Changing profile specific RAM allocation in the CurseForge launcher

FTB App

  1. Go to the Library section of the FTB App.

  2. Hover over an installation and click anywhere on that installation except the play button.

    Accessing the library and profile page for an instance in the FTB App

  3. On the following screen, click on settings.

    Accessing the instance settings in the FTB App

  4. Move the Slider to allocate RAM.

    Allocating more memory to an instance in the FTB App

Technic Launcher

  1. In the top right corner, click on Launcher Options.

    Accessing the settings in the Technic Launcher

  2. Click on Java Settings.

  3. Use the Memory dropdown to select how much RAM to allocate.

    Allocating memory in the Java Settings in the Technic Launcher

MultiMC

  1. Right click the instance you want to allocate more memory to.

  2. Click Edit Instance.

    Accessing instance settings within MultiMC

  3. Click on Settings.

  4. Check the box next to Memory.

  5. Change the value for Maximum Memory Allocation to allocate more RAM.

    Allocating more memory in the MultiMC instancesettings

Void Launcher

  1. Click the options icon in the top right corner.

  2. Use the Memory Size to Allocate To Minecraft dropdown to allocate more RAM.

    Accessing the options and allocating more memory in the Void Launcher

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