I just saw these minimum requirements for a game:
Memory: 2GB for 32-bit OS or 4GB for 64-bit OS
Why does the 64bit OS require more RAM than its 32bit counterpart?
The short answer is yes, 64-bit operating systems almost always require more RAM than corresponding 32-bit operating systems and 64-bit applications often do require a bit more RAM than corresponding 32-bit applications. There are a number of reasons, but the most basic is that pointers take up twice as much space on a 64-bit operating system as they do on a 32-bit operating system.