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A relevant stackoverflow thread for the same,which addresses some common misconceptions http://superuser.com/questions/367490/can-a-32-bit-os-machine-use-up-al

• raverbashing 13y ago
  Yes, but it's still a kludge Yes, some programs can have more memory in 32-bit (example: Photoshop) but, as it says there, you have to keep swapping them So, people, move to 64-bit already, unless you absolutely cannot