Those faster NVidia boards use up more current, if you are worried about not supplying enough juice to your Video Board, try finding one like the Radeon VE, or Geforce MX (or GTS if you can) version. To find out if a Video card is compatible, go to the MB company's support site and see if they give any recommendations. The ATI card uses less voltage than the NVidia cards, but it would be good to make sure before you make your choice.
If it works for you then don't fix it.