Gone are the days when there was a 4GB limit on addressable memory because of the limitations of 32-bit processors.  WinXP and Vista both come in 64-bit version which has a theoretical limit of 16,000,000 GB of RAM
“Back when 32-bit CPUs were first released, the first being the 386-series for the x86 architecture, registrable and accessible memory size increased up to 4GB. While you can plug 4GB into any 32-bit CPU system it will not all be addressable. Why this is, we will elaborate on later.

Today we are going to give you the low-down on the whys of 4GB memory setups and how you can get beyond the 4GB limit, which is not hard with today’s technology.”

Here are some more Memory articles from around the web:

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