You have -Xmx512M in the _JAVA_OPTIONS variable in your environment settings, To remedy this,
Uninstall Razer Synapse / Cortex if you have it
Press the Windows key and the Pause/Break key simultaneously
A window should popup, click on "Advanced system settings"
Click on "Environment Variables"
Delete the _JAVA_OPTIONS entry.
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I tried several times to allocated more ram for minecraft, but it never changes
my RAM is 16Gb
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You have -Xmx512M in the _JAVA_OPTIONS variable in your environment settings, To remedy this,
thanks a lot it worked!!