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To add ram open your luancher and choose edit profile.
Then check JVM Arguments.
Change -Xmx1G to how much you want. If you want 2GB do -Xmx2048M -Xms2048M
Java 32 bit can only have up to 1.5G
1GB -Xmx1024M -Xms1024M or -Xmx1G
2GB -Xmx2048M -Xms2048M or -Xmx2G
1.5GB (32 Bit java) -Xmx1536M -Xms1536M
You can use virtual ram or physical ram. In the picture below I used 4GB phyical ram and 146GB virtual ram.
Virtual ram uses space on your harddrive as ram. You can also use readyboost.
Then check JVM Arguments.
Change -Xmx1G to how much you want. If you want 2GB do -Xmx2048M -Xms2048M
Java 32 bit can only have up to 1.5G
CODES
1GB -Xmx1024M -Xms1024M or -Xmx1G
2GB -Xmx2048M -Xms2048M or -Xmx2G
1.5GB (32 Bit java) -Xmx1536M -Xms1536M
You can use virtual ram or physical ram. In the picture below I used 4GB phyical ram and 146GB virtual ram.
Virtual ram uses space on your harddrive as ram. You can also use readyboost.
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1 Update Logs
Update #1 : by epicanthony76 07/12/2014 12:25:32 pmJul 12th, 2014
Added a way to add more ram for 32bit users and changed -Xmx1G to -Xmx1024M -Xms1024M
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http://windows.microsoft.com/en-us/windows/change-virtual-memory-size#1TC=windows-7
and to use readyboost:
http://windows.microsoft.com/en-us/windows/turn-readyboost-on-off-storage-device#1TC=windows-7
But you only need about 2GB for vanilla and maybe 3-5GB for modpacks