Nah he wont need another power supply for the card, it has 30-32 amps on the 12v, if its the same one im thinking about. But what he may need another PSU for is the 24 pin setup the DFI board requires*
*You dont need the 24 pin PSU But it is Highly Recommended. And Dont use a 20 to 24 pin adapter, Heard that it could result in a damaged Mobo.