The board should auto correct for the proper voltage if you have a late enough BIOS that it will recognize the Athlon II X3. But, being as how the board never was intended for that CPU, it may not recognize it. While it is never advisable to put a processor in the board that requires more wattage that the board is designed for, personally I wouldn't think the 6 watts difference would be enough to worry about. Max wattage will only be demanded occasionally and usually for short periods. But, the first challenge will be getting the board to recognize the CPU.