I have a question. I just upgraded my XPS desktop memory from 1 gig to 4 gigs..and yes..Windows only recognizes 3gigs, no problem. My question is this..I did a Belarc Advisor report to see if it recognizes the 2 sticks. It does..BUT....I believe that my original 1 gig of ram which was 2 sticks of 512mb's each, was in slots 1 and 2...I have my new sticks of ram in slots 1 and 3, does that matter? Should I remove the one in 3 and put it in 2? (There are 4 dimm slots) TY..Jackie **************A Good Credit Score is 700 or Above. See yours in just 2 easy steps! (http://pr.atwola.com/promoclk/100126575x1222846709x1201493018/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072&hmpgID=115&bcd =JulystepsfooterNO115)