This document discusses the differences between 32-bit and 64-bit computer processors. 32-bit processors can address up to 4GB of RAM while 64-bit processors can address much larger amounts of RAM. 64-bit processors are needed to support modern operating systems and software, though some older software may only be compatible with 32-bit processors. While 64-bit processors can theoretically process more data at once, actual speed increases depend on other factors.