So when I went to crucial and typed in my computer to find out what's compatible..two different sticks of ram came up.. everything nis pretty much the same except where it says configuration...the cheaper one has a configuration of 256Meg x 64 and the more expensive one has a configuration of 512meg x 64...what's the difference..and why is the cheaper one cheaper..I've included a link. https://www.crucial.com/compatible-upgrade-for/dell/optiplex-390-desktop
Thank you,
Nick
Thank you,
Nick