Free upgrade to 420 Watt PSU. This replacementPSU can replace your old Bestec ATX-250-12Z C5R 250W HP 440569-001 HP-D3057F3H PSU. Specifications: Main Connector: 20+4Pin +12V Rails: Single Over Voltage Protection Input Voltage: 115 / 230 V Input Frequency Range: 50/60 Hz Output: +3.3V@13A, +5V@13A, +12V1@16A, -12V@0.8A, -5V@0.5A, and +5VSB@2.5A Rise time: Less than 70ms Hold-up Time: 17ms Minimum at Nominal Input Voltage Replace your power supply easily! We take the hassle away! You can use power supply replacement power supply to replace your broken, lagging, or overheating power supply in your old PC! The PSU has all the connectors you need to bring your Bestec ATX-250-12Z C5R 250W HP 440569-001 HP-D3057F3H PSU back to life, and steady power back to your PC!