StarTech.com 450 Watt Silent ATX12V 2.01 PC Computer Power Supply with 120 mm Fan ATX2POW450HS 450 Watt Silent ATX12V 2.01 P4 Power Supply with 12cm Fan Automatic temperature-controlled fan keeps the power supply quiet during low power demand Guaranteed compatibility with Intel Pentium II, III, 4, AMD K6 and Athlon processors (dual and High performance components and connectors are designed for extra long life and provide Improves system reliability by providing stable power to all components