Seasonic prime 850w platinum the seasonic prime platinum 850 watt power supply is a 80 plus platinum certified power supply and guarantees stability and reliability it boasts a near perfect voltage output which represents seasonicrsquos market leading engineering feat this unit is ideal for users who want to reduces noise levels in their work environment as it has an oversized 135 mm fluid dynamic bearing fan that is controlled by seasonicrsquos proprietary premium hybrid fan control a