XP and RAM

Windows XP Home and Professional 32-bit editions can run with 2 Gigs or more of RAM, but because of 32-bit code limitations, the computer will not recognize any more than like 1.5 or 1.7 Gigs (dont remember the exact amount right off hand.)

But in order to take full advantage of 2 gigs and more of RAM in Windows XP, you have to have Windows XP Professional 64-bit version.

Here is a link to an MS article on RAM:

http://support.microsoft.com/kb/555223

Here is a list of RAM limits for current Windows versions:

http://msdn2.microsoft.com/en-us/library/aa366778.aspx

Basically, the 32 bit versions of Windows can address up to 4GB of RAM. However, some of that address space MUST be used for other system tasks and resources.

On a practical basis, you can't make use of much more than 3GB of RAM with ANY 32 bit OS.
Some motherboards and system configurations will limit you even further.

Chas