Athena Power APOLLO 400 AP-MP4ATX40 400W watt high efficiency SFX power supply - Retail Box The APOLLO 400 is a 400 watt high efficiency SFX power supply. This power supply is compatible with many eMachines, HP PCs for power supply replacement and Replacement Partsystem HTPC, Micro PCs. Lan Station, assembly, and it supports 20 pin or 24 pin ATX V2.2 motherboard. Also, it comes with a PCI Express 6pin connector to provide power to the VGA card. It is ideal for basic system upgrade.