I have a Dell XPST 550 PIII. I want to upgrade the processor. I have found 1gig P III processors that are slot one and 100 mhz front side bus same as my 550. Can I just plug it in and go? I have searched the Dell site and can find no info that helps at all. I need an answer from somebody that knows from experience. This is our only computer and we use it for our business, I can't smoke it with an experiment. However I don't expect a gaurantee either.