Re: How much RAM can XP actually use?
XP and Vista will both recognize the same amount of RAM provided they are both the 32 bit versions. I've run both and they both recognize 3.25GB of the 4GB I had in them. The RAM recognized is not OS-dependant (i.e. XP, Vista, Win7), but it IS dependant on whether each OS is 32 or 64 bit.
All three OS's will recognize more than 3.25GB if they run 64 bit.
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