 The Silencer brand of power supply units is available in 400 watt, 500 watt, 600 watt, 750 watt, 850 watt and 1200 watt varieties.The 360 watt and 470 watt versions are also offered in Dell compatible models.PC Power and Cooling also offers a maximum performance line of power supplies, the Turbo-Cool units, which are available in an 860 watt version.