That reasoning is a bit strange... if Windows didn't know for itself where things were in memory, how could anything work

So yes, the windows system memory report has more credibility than some web article

Edit: besides, the article
http://blogs.technet.com/b/markrussi...1/3092070.aspx states that under 7x86 each 1GB card is "only" being mapped for 256MB each, which seems consistent with my findings under XPx86