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Unfortunately you won't be able to play the pack then. The pack needs that as a minimum and with you allocating that amount of memory your system will slow because you will be starving your os of memory.
Yeah like the above user said it is in game you do this. I never mentioned about changing config files.
If you are new to mods then you may want to watch direwolf20's youtube series based on the pack you are trying to play.
That known fix won't work because your issue has nothing to do with that.
Try disabling open computers or try updating the pack as 1.0.2 is available as a beta version.
You need to allocate more memory at least 4gb. If you don't have 8gb total memory then you may have issues because the pack requires 4gb minimum and recommend 6gb.