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Excellent
3,238 reviews at Trustpilot.3,238 reviews
Straight Power 11 CM 1000W Modular PSU, BN285 €195.62
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(2 customer ratings)
Straight Power 11 CM 850W Modular PSU, BN284 €159.03
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Straight Power 11 CM 750W Modular PSU, BN283 €138.58
3 in stock
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(4 customer ratings)
Straight Power 11 CM 650W Modular PSU, BN282 €122.86
6 in stock
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(2 customer ratings)
Straight Power 11 CM 550W Modular PSU, BN281 €110.49
3 in stock
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Straight Power 11 CM 450W Modular PSU, BN280 €100.43
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More variations available Show

Be Quiet Straight Power 11 Full Modular PSUs

The be quiet Straight Power 11 PSUs offer a plethora of features and exceptionally low operational noise.

Features

  1. Virtually inaudible operation
  2. Very quiet SilentWings 3 fan
  3. 80PLUS Gold certification
  4. Fully Modular cable management
  5. NVIDIA SLI Ready and AMD CrossFireX

The be quiet Straight Power 11 series raises the bar for systems that demand virtually inaudible operation without any power or quality compromises. They are clearly the best choice for super quiet systems.

Whether you’re building a high-performance multi-GPU gaming system, assembling an extraordinarily quiet multimedia PC, or simply seeking a better, quieter upgrade for an existing system, the be quiet Straight Power 11 is a great Choice.

SILENT WINGS 3 FAN - Provides virtually inaudible operation

The high-end SilentWings 3 fan delivers best-of-class airflow yet produces very little noise. This is thanks to its unique, optimised fan blade design along with an advanced fluid-dynamic bearing and 6-pole fan motor that largely eliminates operational noise. It has a super-long life and minimal power consumption.

FUNNEL-SHAPED FAN OPENING - Higher cooling performance

The fan inlet of the Straight Power 11 is funnel-shaped. It causes an increased throughput of air which provides higher cooling performance.

WIRE-FREE DESIGN INSIDE THE PSU - Pushing the longevity of components to a maximum

An absolute innovation: The Straight Power 11 is wire-free on the DC side inside the PSU body. This results in improved cooling airflow and less signal disturbance. The benefit of this lack of wiring is that it increases the lifetimes of the components to the maximum.

FULLY MODULAR CABLE MANAGEMENT - Utmost convenience and compatibility

Thanks to the fully modular cable management, 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 much more convenient. Smoother airflow results from the uncluttered layout of the system, which means lower noise and lower temperatures prevail.

80PLUS GOLD CERTIFIED - Impressively high efficiency

Straight Power 11 is 80PLUS Gold efficiency certified, reaching up to 93%. This means less power consumption and a cooler and quieter operation. Truly a benefit for any system.

HIGH-CLASS TECHNOLOGIES - Compatibility for the systems of tomorrow

The use of LLC and Synchronous Rectifier (SR) provides very stable operation and enhanced voltage regulation.The PSU is equipped with DC-to-DC conversion for tight voltage regulation even under heavy cross-loading conditions. This ensures reliable operation with the next generation of processors and graphics cards.

JAPANESE 105°C CAPACITORS - A testament to high quality

Only the best components are used in Straight Power 11. That is why be quiet have built only used high-quality Japanese capacitors in the PSU. They are rated to 105°C, ensuring stability, reliability and a long operating life.


Show specifications and reviews for:
SpecificationsSP 10 1000W CM BN285SP 11 850W CM BN284SP 11 750W CM BN283SP 11 650W CM BN282SP 11 550W CM BN28SP 11 450W CM BN280
Model NumberBN285 BN284 BN283 BN282 BN281 BN281
Power1000W 8500W 7500W 650W 550W 550W
ModularYes Yes Yes Yes Yes Yes
80PLUS CertificationGold Gold Gold Gold Gold Gold
Efficiency (%) at 230V, 20%/50%/100% load92.0, 93.0, 91.0 92.5, 93.4, 91.2 92.3, 93.6, 91.5 91.5, 93.0, 91.2 91.4, 93.0, 91.2 91.0, 93.1, 91.7
+3.3V maximum output current25 A 25 A 25 A 24 A 24 A 24 A
+5V maximum output current25 A 25 A 25 A 24 A 24 A 24 A
+12V1 maximum output current22 A 21 A 20 A 18 A 18 A 18 A
+12V2 maximum output current22 A 21 A 20 A 18 A 18 A 18 A
+12V3 maximum output current30 A 26 A 24 A 22 A 20 A 19 A
+12V4 maximum output current30 A 26 A 24 A 22 A 20 A 19 A
Voltage100–240Vac 100–240Vac 100–240Vac 100–240Vac 100–240Vac 100–240Vac
Frequency50–60Hz 50–60Hz 50–60Hz 50–60Hz 50–60Hz 50–60Hz
Form factor ATX 12VVersion 2.4 Version 2.4 Version 2.4 Version 2.4 Version 2.4 Version 2.4
Dimensions (LxWxH)170 x 150 x 86mm 170 x 150 x 86mm 170 x 150 x 86mm 160 x 150 x 86mm 160 x 150 x 86mm 160 x 150 x 86mm
Noise level at 20% load11.2 dBA 9.7 dBA 8.4 dBA 8.9 dBA 9.0 dBA 9.4 dBA
Noise level at 50% load11.8 dBA 10.6 dBA 9.0 dBA 9.8 dBA 9.5 dBA 9.8 dBA
Noise level at 100% load32.1 dBA 25.0 dBA 21.23 dBA 17.5 dBA 17.2 dBA 12.3 dBA
Active PFCYes Yes Yes Yes Yes Yes
ProtectionOCP, OVP, UVP, SCP, OPP, OTP OCP, OVP, UVP, SCP, OPP, OTP OCP, OVP, UVP, SCP, OPP, OTP OCP, OVP, UVP, SCP, OPP, OTP OCP, OVP, UVP, SCP, OPP, OTP OCP, OVP, UVP, SCP, OPP, OTP
Safety CertificationCE, CB, TUV, FCC, cTUVus, RCM, BSMI, CU CE, CB, TUV, FCC, cTUVus, RCM, BSMI, CU CE, CB, TUV, FCC, cTUVus, RCM, BSMI, CU CE, CB, TUV, FCC, cTUVus, RCM, BSMI, CU CE, CB, TUV, FCC, cTUVus, RCM, BSMI, CU CE, CB, TUV, FCC, cTUVus, RCM, BSMI, CU
Energy Star6.1 6.1 6.1 6.1 6.1 6.1
ErP2013 readyYes Yes Yes Yes Yes Yes
ATX-Mainboard (20+4-pin)Yes Yes Yes Yes Yes Yes
PCI-Express (6+2-pin)6 4 4 4 2 2
P8-/P4+4 Connector1/1 1/1 1/1 0/1 0/1 0/1
SATA Connectors11 11 11 9 9 9
Molex Connectors4 4 4 3 3 3
Floppy Connectors1 1 1 1 1 1
Warranty60 months 60 months 60 months 60 months 60 months 60 months
EAN barcode4260052185803 4260052185797 4260052185780 4260052185773 4260052185766 4260052185759
SpecificationsSP 10 1000W CM BN285SP 11 850W CM BN284SP 11 750W CM BN283SP 11 650W CM BN282
Model NumberBN285 BN284 BN283 BN282
Power1000W 8500W 7500W 650W
ModularYes
80PLUS CertificationGold
Efficiency (%) at 230V, 20%/50%/100% load92.0, 93.0, 91.0 92.5, 93.4, 91.2 92.3, 93.6, 91.5 91.5, 93.0, 91.2
+3.3V maximum output current25 A 24 A
+5V maximum output current25 A 24 A
+12V1 maximum output current22 A 21 A 20 A 18 A
+12V2 maximum output current22 A 21 A 20 A 18 A
+12V3 maximum output current30 A 26 A 24 A 22 A
+12V4 maximum output current30 A 26 A 24 A 22 A
Voltage100–240Vac
Frequency50–60Hz
Form factor ATX 12VVersion 2.4
Dimensions (LxWxH)170 x 150 x 86mm 160 x 150 x 86mm
Noise level at 20% load11.2 dBA 9.7 dBA 8.4 dBA 8.9 dBA
Noise level at 50% load11.8 dBA 10.6 dBA 9.0 dBA 9.8 dBA
Noise level at 100% load32.1 dBA 25.0 dBA 21.23 dBA 17.5 dBA
Active PFCYes
ProtectionOCP, OVP, UVP, SCP, OPP, OTP
Safety CertificationCE, CB, TUV, FCC, cTUVus, RCM, BSMI, CU
Energy Star6.1
ErP2013 readyYes
ATX-Mainboard (20+4-pin)Yes
PCI-Express (6+2-pin)6 4
P8-/P4+4 Connector1/1 0/1
SATA Connectors11 9
Molex Connectors4 3
Floppy Connectors1
Warranty60 months
EAN barcode4260052185803 4260052185797 4260052185780 4260052185773
SpecificationsSP 11 550W CM BN28SP 11 450W CM BN280
Model NumberBN281
Power550W
ModularYes
80PLUS CertificationGold
Efficiency (%) at 230V, 20%/50%/100% load91.4, 93.0, 91.2 91.0, 93.1, 91.7
+3.3V maximum output current24 A
+5V maximum output current24 A
+12V1 maximum output current18 A
+12V2 maximum output current18 A
+12V3 maximum output current20 A 19 A
+12V4 maximum output current20 A 19 A
Voltage100–240Vac
Frequency50–60Hz
Form factor ATX 12VVersion 2.4
Dimensions (LxWxH)160 x 150 x 86mm
Noise level at 20% load9.0 dBA 9.4 dBA
Noise level at 50% load9.5 dBA 9.8 dBA
Noise level at 100% load17.2 dBA 12.3 dBA
Active PFCYes
ProtectionOCP, OVP, UVP, SCP, OPP, OTP
Safety CertificationCE, CB, TUV, FCC, cTUVus, RCM, BSMI, CU
Energy Star6.1
ErP2013 readyYes
ATX-Mainboard (20+4-pin)Yes
PCI-Express (6+2-pin)2
P8-/P4+4 Connector0/1
SATA Connectors9
Molex Connectors3
Floppy Connectors1
Warranty60 months
EAN barcode4260052185766 4260052185759

FAQ

  • Do high wattage power supplies cost more to run?

    No - the rated wattage of a power supply refers to the maximum amount of power it can deliver at full load, not how much power it uses. More powerful PSUs will consume around the same amount of power as lower powered power supplies in any given PC system, so your electricity bill will not be higher when using a more powerful power supply!

    The best way to reduce your electricity bill when using your PC is to use a more efficient power supply or make your PC consume less power by removing components which are not needed, such as extra drives and expansion cards, or by choosing a cooler-running processor or graphics card.

  • My brand new power supply doesn’t work! Am I doing something wrong?

    It’s possible that the power supply may be faulty, but here are some simple things to check. Firstly, a power supply will not work if you simply plug it in and flick the switch. The power supply will only turn on if you connect it to a working motherboard and associated items (processor, memory, video card, etc). It is actually the motherboard which tells the power supply when to switch on.

    Secondly (if applicable), check the voltage is set correctly to 115/230 volts depending on what country you are in. Thirdly, if possible it would be good to try the power supply in another PC to see if it works, or try another power supply in your PC to see if that works. You can then tell whether it is the power supply which is faulty or the actual PC itself. If all else fails, please contact us for further support, and/or return details.

  • Why should I buy a whole new PSU when I could just replace the noisy fan in my existing one?

    Virtually all the noise generated by a PC power supply originates from the cooling fan inside it, so simply replacing the fan with a quiet fan may seem an obvious way to go. However, if you are thinking about attempting this operation, please bear the following points in mind:

    1. Your existing power supply will be designed to run with a specific amount of airflow in order to adequately cool the components inside and reducing the airflow may lead to overheating and damage to the power supply and/or PC.
    2. All PC power supplies contain very high voltages and even with the power disconnected, the voltages stored in the capacitors can be easily enough to kill. It is not recommended to take the cover off any PC power supply for this reason unless you are absolutely confident of your own ability. Because of the grave dangers involved, all PC power supplies by law carry a warning label forbidding removal of the power supply case.
    3. There will be no standard PC fan connector inside the power supply to use to connect a replacement fan, and it would probably have to be soldered directly into the PCB inside the power supply, or have a specialist power connector attached. This can be a tricky operation to say the least.

    Please consider the above points very carefully before proceeding with an operation to replace the fan in your existing power supply!

  • What is PFC (Power Factor Correction)?

    If you are interested in being “green” and saving the planet, you might like to read a short explanation of how our power supplies can save energy using Active PFC (Power Factor Correction), not to be confused with Power Conversion Efficiency which is also very good in most of our PSUs. “Power Factor” is a measure of how efficiently electrical power is consumed. Ideally, Power Factor would be 1 (or 100%) and known as unity.

    Unfortunately in the real world, Power Factor is reduced by highly inductive loads down to values of 0.7 (70%) or less. This induction is caused by equipment such as small electric motors, fans, fluorescent lighting ballasts and transformers such as those in PSUs. This is bad news for the electricity generating companies who can impose a surcharge on heavy users if they have a consistently low Power Factor, as more electricity has to be produced to make up the shortfall.

    Power Factor Correction (PFC) is used in some equipment to minimise the inductive component of the electrical current. This helps to reduce the losses in the electrical supply to that equipment. Power Factor Correction capacitors are normally used to reduce induction in an electrical load, which minimises wasted energy and hence improves the efficiency of a company and reduces electricity costs.

    It is not usually practical to reach unity, i.e. Power Factor 1, and it seems that most electricity supply companies accept consumers having a Power Factor as low as 0.94 (94%) without imposing a surcharge. Unfortunately most of the cheap (and not so cheerful) PSUs tend to have a Passive PF as low as 0.75 or 75% which in a large office can lead to a PF surcharge.

    However, the good news is that most of Quiet PC’s PSUs implement a system known as Active PFC which involves some clever electronics. This means that their power factor (PF) can be as high as 0.94 or 94% (at full load), while harmful harmonic frequencies are reduced to well below legal requirements. So by using our products, you can be happy in the knowledge that you are doing your bit to save the planet!

  • How do I know what size of wattage power supply I need?

    The best answer we can give to this question is to go ahead and take an intelligent “guesstimate"! There are no hard and fast rules about what size of power supply any given PC needs as a minimum. Our advice would be that if you are replacing an existing power supply, then consider a new one at least of the same wattage as the old one. In addition, if you wish to build in a “safety margin” to allow for reliable running and possible future upgrades, consider adding 100-200 watts to the rating of your existing unit.

    If you are building a new PC, most customers now buy a power supply rated in the region of 500-800 watts depending primarily on the performance level of their graphics card(s) and number of drives to be installed. But in any event if you are unsure about which power supply would be best for your PC then please do contact us by phone or email and we will be happy to give you a specific recommendation based on your budget.

  • My new PSU came with a 24-pin connector but my motherboard needs 20 pins! Do I need an adaptor cable?

    We receive many customer enquiries about this. In fact, most of the 24-pin compatible power supplies we sell come with special motherboard connectors which can be converted to 20-pins with no additional conversion cables. All you need to do is look carefully at the connector and you will see that the end four pins can be slid off, turning the connector into a 20-pin compatible one (see below) - easy when you know how!

    Image showing how to change a power supply's 24-pin motherboard connector into a 20-pin connector by unclipping the end four-pin block
    Image showing how to change a power supply’s 24-pin motherboard connector into a 20-pin connector by unclipping the end four-pin block
  • What do the PSU safety protection abbreviations mean?

    There are many possible safety protections a PSU can have. Below is a list of what each abbreviation means. Please note, not all PSUs have all safety protections.

    OCP - Over-Current Protection

    OVP - Over Voltage Protection

    UVP - Under Voltage Protection

    SCP - Short Circuit Protection

    OPP - Over Power Protection

    OTP - Over Temperature Protection

    UL - Underwriters Laboratories, more information.

    TÜV - Technical Inspection Association, more information.

    CE - European Conformity, more information.

    FCC - Federal Communications Commission, more information.

    RoHS - Restriction of Hazardous Substances Directive, more information.

    WEE - Electronic waste, more information.

    80 PLUS - Promotes energy efficiency for PC power supplies, more information.

    ErP - Energy Related Products, more information.

    More information on certification marks can be found here.

Top Quiet Power Supplies

“Very quick and competitively priced”

“Very quick and accessories such as cables are not priced to make your eyes bleed. Nice!”

30th August 2019 via Trustpilot