It will fit in a standard ATX power supply slot, but just won't extend out as deep as a more traditional ATX PSU. These replacement power suppplies can replace many branded desktops like HPs, Dells, Compaqs, etc). It is cooled by an 80mm fan for stability and long-life performance for years to come. The power supply has cabling built in to give you access to SATA, Molex and Floppy disk drive power connectors, as well as a 20+4-pin motherboard connector, and 4-pin CPU.

• Max Wattage: 420 Watts • Total Wattage: 280 Watts • Reduced Depth for Increased Compatibility • AC Input: 110/220V / 47~63HZ • Hi-Pot Tested • Low Ripple & Noise • ROHS & CE • Frequency: 60/50 Hz • Rise time: Less than 70 ms • Hold-up Time: 17 ms Minimum at Nominal Input Voltage • Output Voltage: +5V,-5V,+12V1,+12V2,+3.3V,-12V,+5V-SB • Dimensions: 5.86" x 3.3" • Connectors: • ATX Connector 24 (20+4) Pin x 1 • P4-12V 4 Pin x 1 • SATA 15 Pin x 3 • Molex 4 Pin x 2 • Floppy 4 Pin x 1