First mistake, buying a brand without much recognition. Second of all Most power supplies arent 680w thats a super uncommon wattage, its typically 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 1000, 1100, 1200, 1300. Those are the common wattages for power supplies. What are your exact specs too?