be quiet!
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.

10+ In stock

£105.95 *
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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

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.

- Virtually inaudible operation thanks to a SilentWings® 3 135mm fan
- Big funnel-shaped fan opening of the PSU case for high airflow intake
- Wire-free on the DC side inside the PSU for enhanced cooling and longevity
- Full cable management for maximum build flexibility
- 80PLUS® Gold certification with an efficiency of up to 93%
- Advanced stability and voltage regulation thanks to LLC, SR and DC-to-DC
- Four high-performance 12V-rails
- Powerful multi-GPU support with two PCI-Express connectors
- Japanese 105°C-rated capacitors ensure stability and reliability
- Power signal stability unmatched in its class
- ErP and Energy Star 6.1 ready
- 5-year manufacturer’s warranty
- Product conception, design and quality control in Germany

- Model: Straight Power 11 | 550W
- Continuous power (W): 550
- Peak power (W): 600
- Form factor ATX 12V: Version 2.4
- Form factor EPS 12V: Version 2.92
- Modular cable management: Yes
- Topology: LLC + SR + DC/DC
- Wire-free design (DC-side): Yes
- Voltage (Vac): 100 - 240
- Frequency (Hz): 50 - 60
- Input current (A): 8/4
- PFC: active
- Power factor at 100% load: >0.99
- Compliant to Intel C6/C7: Yes
- Power consumption in standby (W): <0.12
- Average life time (h / 25°C): 100.000
- Operating temperature up to (°C): 40
- Max. combined power 12V (W): 549.6
- Max. combined power 3.3V + 5V (W): 130
- Hold-up time (ms @ 100%): 18.9
- Fan type: be quiet! SilentWings 3
- +SilentWings: Yes
- Motor technology: 6-pole fan motor
- Bearing technology: FDB
- Fan size (mm): 135
- Max. fan speed (rpm), temperature-dependent: 1,500
- dB(A) at 20% load: 9.02
- dB(A) at 50% load: 9.46
- dB(A) at 100% load: 17.22
- Protection: OCP (over current protection), OVP (over voltage protection), UVP (under voltage protection), SCP (short circuit protection), OTP (over temperature protection), OPP (over power protection)
- Safety Certification: CE, CB, TÜV, FCC, cTUVus, RCM (Australia), BSMI, CU (Russia)
- 80Plus Certification: Gold
- Efficiency (%) at 230V, 20% load: 91.4
- Efficiency (%) at 230V, 50% load: 93
- Efficiency (%) at 230V, 100% load: 91.2
- Dimensions without cable (L x W x D), (mm): 160 x 150 x 86

- 1 x 20+4-Pin ATX12V/EPS12V
- 1 x 4+4-Pin ATX12V/EPS12V
- 2 x 6+2-Pin-PCIe
- 9 x SATA
- 3 x 4-Pin-Molex
- 1 x Floppy
- Warranty: 5yr

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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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