Hi - I'm new here. Here my question - I'm 63 and know very little about computers. I just bought a used HP DC7600 and here are the specs - OS - xpp; cd-rw/dvd; p4 - 3ghz; 1gb ram; 80g HD; PSU has 12 A on the 12V rail. Now can I purchase a Zotac 7600gs fanless card to play on this system? I only get into Civ 4 - Auren Trainz - and similar games. If this card will not work any suggestions. Also is this a standard atx psu? If so could I buy a new one and which is a good one if I would want to upgrade to a 8 series card? Thank You