550W PSU 80Plus Platinum be quiet! Straight Power 11 Power Supply – BN305


Be Quiet! 550W Straight Power 11 PSU, Fully Modular, Fluid Dynamic Fan, Quad Rail, 80 Platinum

SKU: BN305 Category: Tags: , ,


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.


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 Bearing: 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

Additional information

Cable Type

Fully Modular




80 Plus Platinum


Be Quiet!



Power Type

Power Supply





model number



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