Be Quiet! 550W Straight Power 11 PSU, Fully Modular, Fluid Dynamic Fan, Quad Rail, 80 Platinum be quiet! Straight Power 11 Platinum 550W raises the bar for systems that demand virtually inaudible operation and outstanding efficiency.     80 PLUS® Platinum efficiency (up to 93,8 )     Virtually inaudible Silent Wings 3 135mm fan     Funnel-shaped fan opening of the PSU case for high airflow intake     Wire-free inside the PSU on the DC side for enhanced cooling and longevity      Modular cables for maximum build flexibility     Powerful multi-GPU support with two PCI-Express connectors     Japanese 105°C-rated capacitors ensure stability and reliability     ErP and Energy Star 7.0 ready     5-year manufacturer’s warranty 80 Plus Platinum Certified     One of the highest efficiency certificates available     Straight Power 11 Platinum 550W is certified with 80 PLUS Platinum efficiency, reaching up to 93,8 . This provides lots of benefits for your high-end system, including less power consumption and an overall cooler and quieter operation. The standby drain is below 0.1 watts. Silent Wings 3 Fan     Provides virtually inaudible operation     The high-end Silent Wings 3 fan delivers best-of-class airflow yet produces very little noise. This is thanks to its unique, optimized fan blade design along with an advanced fluid-dynamic bearing and 6-pole fan motor that largely eliminates operational noise, has a super-long life and minimal power consumption. Funnel-Shaped Fan Opening     Higher cooling performance     The fan inlet of the Straight Power 11 Platinum 550W is funnel-shaped. It causes an increased throughput of air which benefits to a higher cooling performance. Wire-Free Design Inside the PSU     Pushing the longevity of components to a maximum     An absolute innovation: The Straight Power 11 Platinum 550W is wire-free on the DC side inside the PSU body. This results in improved cooling airflow and less signal disturbance, simply because of a lack of wiring, and ultimately pushes the lifetimes of the components to a maximum. Modular Cables     Utmost convenience and compatibility     Thanks to the modular cables, all cables that serve no purpose in the system are left out. For this reason, systems always appear very tidy. At the same time installation is performed much more conveniently. A smoother airflow results from the uncluttered layout of the system, which means lower noise and temperatures prevail inside the case. State-of-the-Art Technologies     Rock-steady signal stability and efficiency     Experience the most technologically advanced power supply be quiet! has ever built! Using an advanced full bridge, LLC and Synchronous Rectifier (SR) technology it provides unmatched signal stability and unbeatable power efficiency. The DC-to-DC conversion for tight voltage regulation, even under heavy cross-loading conditions ensures reliable operation for the next generation of processors and graphics cards. Japanese 105 Capacitors     A testament to high quality     Only the best components are used in Straight Power 11 Platinum 550W. That is why we have built only high-quality Japanese capacitors into the PSU chassis. They are rated to 105°C, ensuring stability, reliability and a long operating life. Specification Form Factor: ATX Modular: Fully Modular Series: Be Quiet! Straight Power 11 Compatability: ATX 12V v2.51 Wattage: 550 W Connectors: \"1 x ATX-Motherboard (20 4-pin) 1 x P4 4 (CPU) 2 x PCI-e 6 2-pin (GPU) 3 x PATA 4-pin 9 x SATA 15-pin (HDD, Drives) 1 x FDD (Floppy)\" Rail Design: Quad 12V AC Input: AC 100-240 V PFC: Active PFC Fan Type: Silent Wings 3 135mm fan (fluid-dynamic bearing) Fan Bearin Fluid / Hydraulic Bearing Noise: dB(A) at 20 load: 9.0 dB(A) at 50 load: 9.6 dB(A) at 100 load: 14.9 80 Certification: 80 Platinum Efficiency: up to 93.8 MTBF: \"100,000 hours\" Protection: Over current Over voltage Under voltage Short circuit Over temperature Over power Features: See Overview Weight/Dimensions: 1.66 kg 160 x 150 x 86 mm Package Weight: 3.2300 kg Warranty: 5 Years