Hello .. I have my Dell Optiplex 760 apart to replace the PSU and I was just wondering if upgrading the CPU would do anything for me ? The current one is a Pentium Dual Core 2.6 GHZ .. From what I have read it looks like I could put up to a 3.3 GHz CPU in ... I'm old .. don't use this for games .. Watch Movies , You Tube , Email , Facebook etc etc .. I'm not afraid to do the upgrade ... I just wonder if I'd notice any difference .. I have been using this computer for approximately 15 years.