be quiet! System Power 11 550W

Proven reliability, quiet operation. The be quiet! System Power 11 550W is built for users who need dependable power delivery, modern compatibility, and low-noise performance at an accessible price point. It follows the ATX 3.1 standard and includes native support for PCIe 5.1 graphics cards through a 12V-2×6 connector, making it ready for current and next-generation PC builds.

Key features

• ATX 3.1 compliant
• Native PCIe 5.1 support
• One 12V-2×6 connector rated up to 300 W
• Two PCIe 6+2-pin connectors for additional GPU support
• 80 PLUS Bronze efficiency
• Temperature-controlled 120 mm quality fan
• DC-to-DC technology for tight voltage regulation
• Strong single 12 V rail for stable system performance
• Low standby power consumption
• 5-year manufacturer warranty

Technical specifications

• Model: System Power 11 550 W
• Continuous power: 550 W
• Form factor: ATX 3.1
• Topology: Double forward + DC-to-DC
• Efficiency certification: 80 PLUS Bronze
• Maximum efficiency: Up to 89.7%
• Fan size: 120 mm
• Fan control: Temperature-controlled
• 12 V rail: Single rail
• Max. combined power on 12 V: 550 W
• PCIe 5.1 / 12V-2×6: 1 connector, up to 300 W
• PCIe 6+2-pin: 2 connectors
• SATA: 5 connectors
• PATA: 1 connector
• Motherboard connector: 1 x 20+4-pin
• CPU connectors: 1 x P4+4, 1 x P4
• Dimensions: 150 x 140 x 86 mm
• Color: Black
• Warranty: 5 years

Why choose it?

The System Power 11 550W combines quiet cooling, modern power delivery standards, and solid protection features to create a reliable foundation for a gaming or productivity PC. It is a practical choice for users who want a trustworthy PSU with future-ready connectivity and no unnecessary extras.