I have two old Dell machines including one large Optiplex GX620 tower and one Optiplex 780 (Small Form Factor tower). I was wondering if I could install my newer smaller motherboard from my Optiplex 780 in the older GX620 case, as that may provide more room and, potentially, more options for expansion? i.e. Two hard drives, etc. Maybe a stupid question but IT is clearly not my forte.