The Smart BX3 series is designed to meet ATX 3.1 standards, offering 550W, 650W, and 750W options. It's perfect for budget-conscious users seeking an efficient and reliable entry-level power supply, backed by a solid 5-year warranty. Equipped with a 120mm fluid bearing fan for superior airflow. Additionally, the built-in Smart Zero Fan spins only when the load reaches a certain percentage to minimize unwanted noise.