Apevia SFX-AP500W power supply is an excellent choice for compact, small form factor systems. With 500W of steady output power, lots of cable connectors and a built-in 80mm automatically thermal sensing fan it is sufficient and quiet to run a new built system or to replace a lagging/bad power supply in an older small form factor system with a wide range of peripherals and versatile applications. IMPORTANT: The power supply will not power on simply by connecting the power cord to both the power supply and wall outlet. Ensure that all the power supply cables are properly connected to the PC for it to power on. IMPORTANT: The 8pin CPU connector can be split apart to become a 4+4 connector by pushing one end of the 4pin down and the other end of the 4pin up for motherboards that require a 4pin power connector. IMPORTANT: The 8pin PCI-E GPU connector can be split apart to become a 6+2 connector by pushing one end of the 6pin down and the other end of the 2pin up for graphics cards that require a 6pin power connector. IMPORTANT: The 24pin motherboard connector can be split apart to become a 20+4 connector by pushing one end of the 20pin down and the other end of the 4pin up for motherboards that require a 20pin power connector APEVIA SFX-AP500W / Micro ATX / SFX 500W Power Supply Connectors: 1 x 20+4pin Main Power, 1 x 8pin 12V(P4+4), 1 x 6/8pin PCIe, 3 x SATA, 2 x 4pin Molex Dimension: 125mm x 100mm x 63.5mm (4.9" x 3.94" x 2.5") - L x W x H The power supply will not power on simply by connecting the power cord to both the power supply and wall outlet. Ensure that all the power supply cables are properly connected to the PC for it to power on. The 8pin CPU connector can be split apart to become a 4+4 by pushing one end of the 4pin down and the other end of the 4pin up for motherboards that require a 4pin power.