be quiet! SYSTEM POWER 11 550W - Power Supply

be quiet! SYSTEM POWER 11 550W - Power Supply arrives as a robust ATX PSU designed for dependable everyday performance and efficient power delivery.

This 550 W power supply supports an AC input voltage of 200–240 V and operates at 50 Hz with an input current of 4 A, delivering a reliable maximum combined +12V output of 550 W and overall efficiency around 89.7% (80 PLUS Bronze certified).

The SYSTEM POWER 11 features a single +12V rail architecture with a maximum +12V1 current of 45.83 A, plus combined outputs of 120 W for +3.3V and +5V, and dedicated standby and -12V rails. Hold-up time is 16.86 ms which helps maintain system stability during brief power disturbances.

Protection is comprehensive and includes over current, over power, over voltage, overtemperature, short circuit, surge & inrush protection and under voltage safeguards. The unit meets multiple compliance standards (CB, CE, RoHS, TÜV mark, UKCA, WEEE) and carries sustainability certifications such as ENERGY STAR and ErP.

Connectivity is generous for a non-modular PSU: a 20+4 pin ATX motherboard connector, 2x 6+2 pin PCIe connectors plus a 12-pin PCIe, one 4-pin Molex, five SATA power connectors, a 4-pin CPU P4 connector and a 4+4 pin CPU power connector. This makes it suitable for mainstream gaming PCs, content-creation rigs, or office builds with multiple drives.

Cooling is handled by a 120 mm rifle-bearing fan running up to 1800 RPM and producing about 24.2 dB of noise, giving a balance between thermal control and quiet operation. The active cooling, on/off switch, and solid MTBF of 100,000 hours underline its durability.

Physically the PSU follows the ATX form factor (ATX 3.1, EPS 2.92) with compact dimensions (150 x 86 x 140 mm) and a weight of 1.92 kg. It ships in a box with included screws and cable ties and has been designed for straightforward installation in standard PC cases.

Use cases: ideal for users building a reliable mid-range gaming PC, workstation for photo/video editing with several SATA drives, or an office machine requiring steady, certified power delivery and good protection features.

• 550 W total power, single +12V rail (550 W)
• 80 PLUS Bronze, ~89.7% efficiency
• Multiple PCIe connectors (2x 6+2, 1x 12-pin) and 5 SATA power ports
• Comprehensive protection suite and certifications
• 120 mm rifle-bearing fan, 24.2 dB noise level