Hello, I bought an '09 mac pro quad, and went to crucial and trusted their 'maxed out option' for getting 6bg of RAM... http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=4BBBD53EA5CA7304 I understand that there are four slots, and that even though 6gb of ram is somehow ideal for the new processors, that a full 8 gigs would be of greater benifit in general. Two questions: -is this true? -WHERE DO I BUY ANOTHER 2GB STICK THAT MATCHES THE RAM I BOUGHT FROM CRUCIAL? I can't seem to find on their website the ability to buy just one 2gb stick of this type! thanks, r.