SS-400H2U is a 400W full range AC input 2U ATX/EPS power supply, with dedicated output voltage lines to get the power precisely where and when you need it most. Multiple +12V outputs provide sufficient power for dual processor applications and 240VA limit protection for latest safety requirements (optional).SS-400H2U has no minimum load on the +3.3V rail allowing all applications to be handled by the one power supply, and super high efficiency making it run 20% cooler and save 15% energy compared to lower efficiency units on the market. This PC power supply is also has a high 50C operating temperature making it more stable and reliable within high density rack mount systems.