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Straight Power 11 550W 80 Plus Gold Modular Power Supply

  • be quiet! Straight Power 11 550W raises the bar for systems that demand virtually inaudible operation without power quality compromises. This PSU is clearly the best choice for super silent systems.

8 In stock

£99.95 *
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Stock Code: CA-127-BQ

EAN: 4260052185766

MPN: BN281

Manufacturer: be quiet!

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Product information:

Straight Power 11 550W 80 Plus Gold Modular Power Supply

The power supply and fan specialists at Be Quiet! have managed a small stroke of genius. Finally, with the latest Extension Stage 11 of the Straight Power Series, a power supply unit has been presented that is more than just a new revision with minor improvements in detail. Be Quiet! has again launched a product on the market that has been significantly enhanced in terms of efficiency, layout and connectivity - and that once again runs whisper-quiet.

The Features of the Straight Power 11 550W at a Glance:

  • Fully modular cable management
  • New half-bridges with LLC resonance transducers for higher performance
  • Higher efficiency thanks to 105-degree Celsius electrolytic capacitors and solid capacitors
  • 50 Watts more performance
  • Ultra-quiet 135 mm SilentWings 3 fans
  • 80 Plus Gold certified

Superb Power Supply with Incredible Efficiency

The Straight Power series stands as always for high quality. They represent the broad middle-class of Be Quiet's! range and are available in a range of performance levels as will as with and without cable management. This means there is the right model for almost any challenge. All of them use a common PSU casing that comes with an impressive anthracite look and unusual fan grids that make it very visually appealing.

All performance versions of the Straight Power 11 are equipped with 135 mm fans from the Silent Wings 3 range, and these additionally come with an advanced frame design. De-coupling and lower fan speeds together move plenty of hair while ensuring the Straight Power 11 series functions at even lower noise levels than its predecessors. This model produces a maximum 17,2 dB(A) which for the average ear is virtually inaudible once installed.

Performance Increases Thanks to Premium Components

When it comes to efficiency the Straight Power 11 series leaves no stone unturned and comes with 80 Plus Gold certification. These means the power supply is up to 93 percent effective (!) - something which not many manufacturers achieve, at least not in the mid-range segment. Stand-by power usage has been decreased once again and amounts to around 0,12 Watts. Not only are the Straight Power PSUs fantastic in performance terms, but also in terms of their impact on the environment.

The great specs on offer with the Straight Power 11, along with many other positives, are thanks in no small part to the use of Japanese 105-degree Celsius electrolytic capacitors and solid capacitors. Additionally, new half-bridges with LLC resonance transducers are used. The fully modular cable management provides improved airflow for the power supply and, as a result, an increased lifespan. These improvements allowed Be Quiet! to increase performance by 50 Watts and even offer this version with a full 550 Watts.

The 550 Watt represents a leading model in the series. Correspondingly it comes with four independent 12 V rails which combine to offer 45,8 Amps and 549,6 Watts. This is supplied to the motherboard by means of a 20+4-pin ATX connector, a 4+4-pin EPS cable. The graphics card(s) can be powered via two 6+2-Pin PCIe connectors and nine SATA as well as three Molex connectors for powering peripherals.


  • Dimensions: 150 x 86 x 170 mm (W x H x D)
  • Fans: 135 mm (automatically controlled Silent Wings, 9 - 17,2 dB(A))
  • Efficiency: max. 93 % (50 % load), incl. 80 Plus Gold Certification
  • Aktiv PFC
  • Form Factor: ATX12V 2.4 / EPS12V 2.92
  • Performance: 550 W
    +3,3V: 24 A
    +5V: 24 A
    +12V1: 18 A
    +12V2: 18 A
    +12V3: 20 A
    +12V4: 20 A
    +12V (total): 549,6 W / 45,8 A
    -12V: 3,6 W/ 0,3 A
    +5Vsb: 15 W/ 3 A
  • Connectors:
    1x 20+4-Pin (ATX12V)
    1x 4+4-Pin (ATX12V / EPS12V)
    2x 6+2-Pin PCIe
    9x SATA
    3x 4-Pin Molex
  • Cable Length: 55 - 70 cm
  • Life Expectancy: 100.000 h
  • Manufacturer's Guarantee: 5 Years

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Customer review

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super quiet efficient power supply

cracking little power supply,tons of leads,very quiet and efficient and 5 year guarantee. review here:

fastboy 2018-06-21

Very good PSU that is let down by being very overpriced and short warranty length compared to it's rivals.

This is my honest opinion of this PSU. I was sent one of these by OCUK/BeQuiet for the purposes of reviewing it. I found it to be a good looking, high quality, solidly built unit with quality heavy black braiding on the cables.
It is very efficient and very quiet at the maximum load I was able to apply to it (367w at the wall) using OCCT's PSU torture test. It has a BeQuiet Silentwings 3 135mm fan which although it remained inaudible for the whole of the 90 minute torture test does a fine job of keeping the internals cool. Ambient air temperature was 18.7 degrees C yet near the end of the 90 minute test the PSU exhaust temperature was only 22.5 degrees C.
The specs of the pc it was powering are as follows:-
Intel i7 4790k overclocked to 4.6Ghz @ 1.26v
Asus Maximus VI Hero
4x 4Gb Samsung Green overclocked to 2133mhz 9-10-10-21-1T @1.5v with most second and third timings also tightened up
Inno3D GTX 1070 iChill X3
Creative Soundblaster Z
2x 200mm Aerocool Silentmaster fans (rear exhaust)
2x 200mm Bitfenix Spectre Pro fans (front intake)
Zalman ZM-MFC2 multifunction controller
Lamptron FC2 fan controller

Alphacool VPP655 Vario with Heatkiller D5 top
Alphacool Eisblock XPX
Aquacomputer GTX 1070/1080 full cover block
Coolgate CG360 360mm rad
Coolgate G2 360mm rad
6x Powercool Glacier 120mm fan
6x OCUK/Silverstone SST-FQ121WC 120mm fans
1x XSPC water temperature monitor

You can read the full review plus pictures at

At the end of the day the question is would I buy this PSU myself? At the end of the day it comes to the question of would I buy one of these PSU's? Unfortunately the answer would have to be no. Don't get me wrong, it is a excellent PSU that is very quiet and efficient, it's just extremely overpriced at it's current price of £105.95 and the warranty is only 5 Years which is considerably behind BeQuiet's rivals. The Seasonic Focus Plus 550w is gold rated and fully modular yet is £26 cheaper (even the platinum version is £9 cheaper) than the BeQuiet and has double the warranty length at 10 years. Antec's Earthwatts Pro 550w which is semi-modular has a 7 year warranty and is £30 cheaper than the BeQuiet. I think BeQuiet needs to have a solid rethink of their pricing and warranty as there is little here to justify the premium price. I give it 8/10 due to the price and warranty length. If it was competitively priced and matched the warranty of it's rivals it would have scored higher.

pastymuncher 2018-06-21

super quiet efficient power supply

top quality fully modular power supply with lots of modular cables,whisper quiet in use and looks nice too.5 year guarantee should say it all.

fastboy 2018-06-12

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