Hello! I have a few questions! I need to know if there is a PSU upgrade that can put out 450 watts. If this is not possible, can you tell me if this system uses a non standard motherboard or not?
It does use a non standard MB and the following will give you more information on a PSU swap.
https://www.dell.com/community/Inspiron-Desktops/Inspiron-3668-PSU-upgrade/td-p/6160035