psu voltage

i got 1 question about the psu.
let say you have a computer that is one year old, alienware. you havent change any thing, no overclock.
and you want to upgrade your graphics card, which you also need a new psu. so you changed your graphics card and a old psu,
before you use that computer, is there things you need to set up?
like psu voltage? will the new psu gives cpu the same voltage as the old psu??

that is my question, and thanks
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More about voltage
  1. Your new PSU would give the exact same voltages to all the components as before. Provides it's of the same standard (ATX).
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