COMPACT SIZE: 140 MM deep fits ALL ATX systems. FULL MODULAR: Use only the cables you need to reduce clutter to maximize airflow for a better ventilated system. 80 PLUS GOLD: Less energy gets wasted during power conversion; Cut down your electricity usage and be Eco-Friendly. PREMIUM HYBRID FAN CONTROL: Unsurpassed silent performance in Fanless Mode. The fan control button at the back of the power supply allows users to customize cooling needs by selecting between Seasonic S2FC (fan control without Fanless Mode) and S3FC (fan control including Fanless Mode).