Is the 3 gig switch safe on windows xp home edition

I a dell dimension e510 with win xp home edition,i been doing a lot of research on the memory issues on win xp and every were i read i seen that win xp should see 3gigs to 3.2gigs of memory with out the 3gig switch installed if you have 4gigs of memory installed.I have 4gigs of total memory installed on my dell and my bios and system info says 4gigs of memory but windows xp says 2gigs not 3 or 3.2gigs any reason why ? thanks
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  1. Some hint here:

    4 gb of Ram is only showing up as 2 gb in Windows XP

    The RAM reported by the System Properties dialog box....

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