For most would-be Windows 7 users, a 64-bit version of Windows 7 is the right move. But if you don’t have sufficient RAM (at least 4GB), or you rely on devices that don’t have supporting 64 ...

The 64-bit version of Windows has certain advantages. While the 32-bit version is limited to 4GB of RAM–and can’t really make use of all that–the 64-bit version can address up to 8TB.