It is a fact of the modern world that high technology requires constant refinement and unending improvement and that is even truer for those who would be leaders. Dark Power Pro power supplies are renowned as the worlds quietest and most efficient high-performance PSUs. The Dark Power Pro 11 550W model takes that a step further with a power conversion topology that delivers 80PLUS Platinum performance, add to that an unparalleled array of enhancements that augment this units compatibility, convenience of use, reliability, and safety, and the result is the most technologically-advanced power supply be quiet! has ever built. Features- Full bridge, LLC, SR and DC/DC technology for 80PLUS Platinum certification and up to 94% power conversion efficiency. - Virtually inaudible operation thanks to a broad array of optimizations, including the use of a be quiet! SilentWings 3 135mm fan. - SilentWings 3 fan features an advanced fan frame, an airflow-optimized fan blade, fluid-dynamic bearing with copper core and a high-quality 6-pole motor for less vibration. - The funnel-shaped fan opening of the PSU case is significant big and allows high airflow intake. - 550 Watts of continuous power provide intensive power reserves for demanding computing applications. - Overclocking key allows switchover between quadruple independent 12V-rail mode and high-performance single-rail operation. - NVIDIA SLI Ready and AMD CrossFireX certifications allow you to build powerful Multi-GPU systems with confidence. - Cable management with extra long cable reach simplifies component installation and reduces annoying clutter, increasing airflow and improving cooling in even the largest PC cases. - Premium 105C-rated Japanese capacitors maximize reliability - Intelligent control for up to 4 case fans - 5-year manufacturers warranty - Product conception, design and quality control in Germany. Specifications- Model: 550w - Article No. BN250 - EAN Code: 4260052183755 - Voltage/Frequency: 110-240Vac / 50-60Hz - ATX 12V 2.4 / EPS 12V 2.92: Yes/Yes - Dimensions (L x W x H): 180 x 150 x 86 - SilentWings 3 fan (mm): 135mm - Noise Level (dB(A)) at 20 / 50 / 100% load: 8.7 / 8.9 / 10.1 - Efficiency (%) at 230V: Up to 94 - 12V-rails: 4 - Active PFC: Yes - OCP, OVP, UVP, SCP, OPP, OTP: Yes - Certifications: 80PLUS Platinum, AMD CrossFireX, NVIDIA SLI - Energy Star 6.0 compatible: Yes - ErP2014 ready: Yes - Lifetime of fan at 25C (h): 180,000 Connectors- 1 x 20+4-Pin ATX12V/EPS12V - 1 x 4+4-Pin ATX12V/EPS12V - 1 x 8-Pin ATX12V/EPS12V - 4 x 6+2-Pin-PCIe - 1 x 6-Pin-PCIe - 8 x SATA - 5 x 4-Pin-Molex - 1 x Floppy - Warranty: 5yr