Designed for the TFX form factor to provide compact flexibility for small computer cases. It is also compatible with many main brand systems. The Manual TFX 300 Watt PSU output connector includes a 24(20 4) pin, P4-12V 4pin, SATA II 15pin, Molex 4pin, and FDD 4pin. This PSU also includes an internal 40mm ball-bearing fan and thermal fan speed control for maximum heat and noise dissipation. Smart Auto Fan Speed Controller With its thermal fan speed control it will detect the amount of heat generated by the computer and spin accordingly. Using this controller to detect the heat levels of the PSU it will adjust the fan speed accordingly, with this feature built in, worrying about the heat level of a PSU becomes almost non-existent. Silence is Golden Athena Computer Powers designers have designed a low ripple and noise feature that is included within the PSU, taking customers needs into consideration for whatever they may be using this TFX PSU for, the electrical ripple and noise has been significantly reduced for a more quiet system. In addition, Athena Computer Power provides a complete solution for their customers by creating a cross reference sheet users can access with their smart phones by scanning the QR code.