My 4GB works just fine (4x1GB sticks) - XP Pro, but XP Home has the same
limit.
The limitation you are speaking was for Win9x OS's, where a tweak was
required to the VCACHE setting when the machine had over 512MB of memory
(can't remember if the tweak was in the "win.ini" or "system.ini" though -
dang this old age) - this limit is non-applicable to NT OS's (NT 4.0, 2k,
XP).
When adding additional memory though, the memory adding must be of the
same type, speed and stepping as the sticks already installed - unlike Win9x
OSs, XP is more - well say - less forgiving in that area, where memory don't
exactly match, where Win9x would say - hey it works - I guess it's good
enough for gov't work, its good enough for me.
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