Corsair RM Series, RM550, 550 Watt (550W), Fully Modular Power Supply, 80+ Gold Certified The latest ATX12V v2.31 and EPS 2.92 standards and it is backward compatible with ATX12V 2.2 and ATX12V 2.01 systems. 4th generation Intel Core processor Ready (Intel Haswell and Z87 motherboards) 80PLUS Gold certified, delivering over 92% energy efficiency at real world load conditions. Low-profile, flat cable design reduces air friction and helps maximize airflow through your computer's chassis. High-quality Japanese capacitors provide uncompromised performance and reliability. Active Power Factor Correction (PFC) with PF value of 0.99. Over-voltage and over-current protection, under-voltage protection, and short circuit protection provide maximum safety to your critical system components. Universal AC input from 100-240V, A five year warranty and lifetime access to Corsair's legendary technical support and customer service.