Power Supply Question

If I already have a fully built computer, can I simply buy a power supply and attach it to ONLY the graphics card and leave all the other wires tied up?
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More about power supply question
  1. Some videos on the subject.
  2. Why does it need to be tweaked?
  3. OK, "tweaked". It require 1 step, instead of just plug it in : )

    Just make it like this. ( use green wire and back wire (18 AWG) )

  4. Why?
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