How much Ram can Windows XP Pro handle?

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32 bit XP can address a maximum address space of 4GiB.

Keep in mind that part of that space is used by the System BIOS, the BIOS on any add in cards, and buffers used by hardware (mouse, keyboard, modem, ethernet, etc). Also, the video card may use some of that memory (shared memory) in addition to what it has built in.

So even with 4 GiB installed, Windows will typically show only 2.5-3.5 GiB as being available; the addresses of the rest of the RAM is being used by other devices.

HTH

Jerry
 

Darkst4r

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Is that only applicable if using 4 gigs ? My system has 1.5 gig and reads 1.5 gig in properties.
 
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Yes, it will only have an affect if there are not enough addresses that are not being used by ram. As long as the address space needed by hardware+address space for installed RAM totals less than 4GiB you won't see a reduction in available RAM reported by Windows.

With 3 GiB of RAM installed on some systems you might see less than 3 GiB available.

Jerry
 
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