Hi gang! :) I am brand new to the list so please forgive me if I don't get this right the first try. I have an HP 751n with 256 meg of ram. My ram is pc2100 133mhz and I only have 1 256 stick. I want to buy a 512 stick and not sure exactly what I can and can't use. I understand that if I wish to add to the 256 that I already have I must get the exact type of ram that I already have. But my other concern is that if I were to remove the 256 stick and just put in a 512 stick can I change the type of ram that I use? would it be possible to use a 512 pc2700 at 333mhz? Any and all opinions will be helpful in my quest to upgrade my ram. Thanks in advance, JD Howell - Users can unsubscribe from this list by sending email to 24hoursupport-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field OR by logging into the Web interface at http://webpages.charter.net/chizotz/