I just got my new 7900GT from newegg today, I know that the 7900GT asks for a 400watt power supply, atm I have a 300watt. So my question is, with me having a 300watt power supply, would it hurt my new 7900GT? Or would it just not work to its full potential? I plan to go get a new 430watt power supply tomorrow, but for today im stuck with my 300watt.