[r0nin89]

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

See I've always thought that but I remember reading somewhere an article that was something along the lines of "32 bit system, really only good for 3gigs of ram".

Originally Posted by transamws686

There is a 64-bit version of XP too.

Which is a good idea to steer clear of. It has no software support, practically everything runs in 32bit mode on it anyway therefor defeating the purpose of it.