Although Windows Vista tries to gradually carve out its place in the landscape of Microsoft operating systems, his brother XP continues to be alive and well thanks to Microsoft's decision to make it available until 2010 for the Netbook.
Many have always been convinced that Windows XP supports up to 3GB of RAM, but now we're going to see why it is not so ...
As we read in "Memory Support and Windows Operating Systems" Microsoft (unfortunately only in English): Windows XP Professional supports up to 4GB of RAM.
The misconception that Windows XP only supports up to 3.2GB of RAM was due to the fact that the system finds the physical address of RAM and being a 32bit system can calculate a maximum, in fact, to 3.2 GB of RAM .
Going to check, in fact, in the System Properties Windows reports only 3.2GB of RAM available in the "User Space".
To be honest the virtual address space for processes and applications is limited to 2 GB which, translated for the uninitiated, means that applications that run on the system we normally can get to make the most of the other 2GB of RAM 2GB are used by the kernel virtual address space and, therefore, from the Services.
In fact, then, the system reports to see 3.2GB of RAM, but only uses 4.
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