I read this in my ASUS manual:
IF you installed four 1GB memory modules, the system may detect
less than 3GB of total memory because of address space allocation
for other critical functions. This limitation applies to Windows XP
32-bit version operating system since it does not support PAE
(Physical Address Extension) mode.
If I were to install 4GB of memory into a maching runing Windows XP Professional what would happen? What about Windows XP Professional x64?