300W In many ways the SFX form factor could be considered a "little brother" to ATX. It is mostly interchangeable with the ATX power supply. The Spire Jewel SFX Power Supply provides everything small form factor systems need - stable power delivery, hi-efficiency, optimal cooling, low noise operation and long term reliability. The single 80mm fan provides sufficient airflow and low noise operation. It is designed for all AMD and Intel based systems and complies with 12V SFX and MINI ITX 3.0 specification.