Not enough allocated RAM

[Ausimon]

I tried to allocate more memory to my laucher, I don't know what else i need to do, it's only letting me go up to 1GB and I have 128GB of RAM so I know that I have enough, I just want to know where in the settings I can allocate more memory to the launcher and the mod pack! thanks! :)

[JaariAtmc]

Actually install java 64bits.

[Apemon7]

When it limits allocated RAM to 1 GB, the reason that is occurring 99% of the time is because you are trying to run it with 32-bit java. You will need to uninstall your current Java runtime environment and install the 64-bit version from here.