How do I run IntelliJ 64-bit?

In C:\Program Files (x86)\JetBrains\${Intellij Idea version}\bin , there is an executable called idea64.exe . This is for 64-bit systems. You can simply change your IntelliJ shortcut path to it. You also need to add a new environment variable IDEA_JDK_64 pointing to your 64-bit JDK so IntelliJ can use a 64-bit JDK.

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