More specifically, if you look here, there's a neat table a'top the page. In 32-bit, you're limited to 4GB of virtual memory (more like 3GB usable), whilst in 64-bit you can have 16TB. Can you imagine? 
While 32 bit is limited to 4GB, the system will consume some...leaving you with just over 3GB, so most would not recommend putting anything larger then that in ye' computer, without expecting there to be some waste.
While 32 bit is limited to 4GB, the system will consume some...leaving you with just over 3GB, so most would not recommend putting anything larger then that in ye' computer, without expecting there to be some waste.
