Not quite sure I understand exactly what you are asking, but in any event the answer is yes to either case.
In connection with power supply unit (PSU) quality is important. I would suggest that you would be well advised to purchase one approved by AMD for the processor you have. In my work experience, stabililty problems have very often been traced to poor supply feeds from the PSU.
If on the other hand you are referring to voltage supplied to CPU, then yes here too. In brief, the more you expect to OC, the more you should expect to have to increase voltage to CPU to obtain stable system.
Hope this helps.