Beware Antec TrueControl 550's. they are an awesome PSU, but i have had two go bang on me. one through having a component leg not cut off completly on the PFC board and arcing out on the chassis, and other from having a dodgy potentiometers on the control board which popped something. both were RMA'd and i have one thats been in use 24/7 for nearly 5 months now