How to upgrade old computer psu?

[tonyantonio]

I have this old computer I am upgrading and it has a 3oo watt power supply
I am thinking to upgrade it, so will new psu's work wth it

 

[Traildriver]

What hardware do you have and what are you planning to with it?

 

[tonyantonio]

Just a video card and ram

Its a dell Optilex 745C