[WildBillyT]

Originally Posted by ryanfx

This isn't true at all. 32 bit systems have 32 bits of addressable memory space. That memory space first gets allocated by the Windows kernel to hardware registers and cache such as graphics cards / hard drives, then the remaining chunk becomes addressable to your RAM. It's limited by the OS, not by your application. If your application requires more than 4GB the OS will virtualize further storage into your system swap or page file.

EDIT: There's also nothing arguable about it, 32 bit systems support 4GB of RAM

Beat me to it, Ryan!