Here, are important landmarks from the history of 64-bit processors: Here, are important landmarks from the history of 32-bit processors:
32-bit processors need a 32-bit operating system whereas 64-bit processors can run either on 32 or 64 64-bit operating systems.32-bit systems limited to 3.2 GB of RAM while 64-bit systems will enable you to store up to 17 Billion GB of RAM.32-bit processors have 4 GB addressable space while 64-bit processors have 16 GB addressable space.