Like Ashzification said I would pick a pack then disable some of the mods using the edit modpack button. I can't say for certain which ones to disable but I would start with the worldgen ones e.g Biomes 'o' Plenty, Ars Magica 2, Thaumcraft and also use a different minimap then opis because it uses a lot of memory. But it is just a a case of trial and error i am afraid.Is there a number of mods for 1.6 that will work on 32bit... ? i could remove maybe 10-12 mods..
I don't know you will just have to try it and see how it works. But if you only have 2gb of ram I would suggest a ram upgrade unless your system is old.I have 2 gigs of ram.. so no 64bit for me.. I think with : Billund,ComputerCraft,denLib,Flat Signs,Magic Bees,BiblioWoods Natura,GateCopy,Hats,Hat Stand,InfiniBows,Opis,Natura,OpenPeripheral,qCraft,Switches,Tropicraft,MFFS Calclavia ? Would DW20 1.6.4 pack without these mod be playable on 32bit ?