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Excellent
3,238 reviews at Trustpilot.3,238 reviews
Pure Power 10 700W Quiet PSU, BN275
Discontinued
Pure Power 10 600W Quiet PSU, BN274
Discontinued
Pure Power 10 400W Quiet PSU, BN272
Discontinued
Pure Power 10 300W Quiet PSU, BN270
Discontinued
More variations available Show

be quiet Pure Power 10 Power Supplies

The be quiet Pure Power 10 PSUs offer a plethora of features you would only expect to see on more expensive power supplies.

Features

  1. 12V-rails ensure rock-solid voltage stability for powerful multi-GPU systems
  2. 80PLUS certification and up to 91% power conversion efficiency
  3. Exceptionally quiet operation features a silence-optimised 120mm be quiet fan
  4. Stable operation thanks to DC-to-DC power conversion technology
  5. Attractively sleeved cables simplify component installation

PURE POWER is the entry-level series of power supplies from be quiet! and offers the proven reliability and security of the market leader. The units stand out for their quiet, efficient operation and solid quality. They are especially well suited for classic office and web applications, standard graphics applications and basic gaming.

The Pure Power 10 PSU series stands for peerless dependability and best-in-class features. Whether you are assembling a very quiet system, upgrading an existing PC, building a multimedia or a multi-GPU gaming system, your build will benefit from this PSU series. It simply has the best combination of features, performance and quality at very popular price.

Engineering

  • Two independent 12V-rails improve power signal stability.
  • Active Clamp and Synchronous Rectifier (SR) technology produces very stable operation.
  • DC-to-DC conversion for even tighter voltage regulation under heavy cross-loading conditions.
  • Four PCI express connectors for multi-GPU system configurations.
  • Full suite of top safety protections defends against over-currents, over- and under-voltages, short circuits, overheating and overloads.
  • High-quality sleeved cables simplify component installation, increase airflow and improve cooling.
  • All-in-one cable with convenient easy-plug HDD connector.

Energy Efficiency

  • 80PLUS certification means very high operating efficiency for its class of up to 91%.
  • High efficiency means cost savings, less wasted heat, and an overall quieter operation.
  • Standby drain of less than 0.11 watts.
  • Meets Energy Star 6.0 guidelines.
  • Fulfils ErP 2014 guidelines.
  • Zero Load design supports Intel’s Deep Power Down C6/C7 mode.

Exceptionally Quiet Operation

  • High-quality 120mm be quiet! fan is thermally controlled and optimally governed to strike the best balance between effective cooling and deep quietness.
  • Airflow-optimised fan blades reduce turbulence, enabling a best-in-class quiet function with excellent airflow.
  • High efficiency design produces low operating temperatures.


Show specifications and reviews for:
SpecificationsPure Power 10 300WPure Power 10 400WPure Power 10 600WPure Power 10 700W
Model NumberBN270 BN272 BN274 BN275
Power300W 400W 600W 700W
ModularNo No No No
+3.3V maximum output current21 A 25 A 25 A 25 A
+5V maximum output current15 A 15 A 18 A 20 A
+12V1 maximum output current18 A 24 A 32 A 36 A
+12V2 maximum output current18 A 20 A 28 A 30 A
Voltage100–240Vac 100–240Vac 100–240Vac 100–240Vac
Frequency50–60Hz 50–60Hz 50–60Hz 50–60Hz
Form factor ATX 12VVersion 2.4 Version 2.4 Version 2.4 Version 2.4
Dimensions (LxWxH)150 x 150 x 86mm 150 x 150 x 86mm 150 x 150 x 86mm 150 x 150 x 86mm
Noise level at 20% load10.6 dBA 10.6 dBA 11.2 dBA 11.6 dBA
Noise level at 50% load10.8 dBA 11.1 dBA 12.5 dBA 13.1 dBA
Noise level at 100% load13.2 dBA 16.2 dBA 23.6 dBA 27.3 dBA
80PLUS CertificationBronze Silver Silver Silver
Active PFCYes 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
Energy Star6.0 6.0 6.0 6.0
ErP2013 readyYes Yes Yes Yes
Lifetime of fan at 25°C100,000 hours 100,000 hours 100,000 hours 100,000 hours
ATX-Mainboard (20+4-pin)Yes Yes Yes Yes
PCI-Express (6+2-pin)1 1 4 4
P8-/P4-connector1x P4+4 1x P4+4 1x P4+4 1x P4+4
SATA Connectors4 5 6 6
Molex Connectors2 2 3 3
Floppy Connectors1 1 1 1
Warranty24 months 24 months 24 months 24 months
EAN barcode4260052185292 4260052185315 4260052185339 4260052185346
SpecificationsPure Power 10 300WPure Power 10 400WPure Power 10 600WPure Power 10 700W
Model NumberBN270 BN272 BN274 BN275
Power300W 400W 600W 700W
ModularNo
+3.3V maximum output current21 A 25 A
+5V maximum output current15 A 18 A 20 A
+12V1 maximum output current18 A 24 A 32 A 36 A
+12V2 maximum output current18 A 20 A 28 A 30 A
Voltage100–240Vac
Frequency50–60Hz
Form factor ATX 12VVersion 2.4
Dimensions (LxWxH)150 x 150 x 86mm
Noise level at 20% load10.6 dBA 11.2 dBA 11.6 dBA
Noise level at 50% load10.8 dBA 11.1 dBA 12.5 dBA 13.1 dBA
Noise level at 100% load13.2 dBA 16.2 dBA 23.6 dBA 27.3 dBA
80PLUS CertificationBronze Silver
Active PFCYes
ProtectionOCP, OVP, UVP, SCP, OPP, OTP
Energy Star6.0
ErP2013 readyYes
Lifetime of fan at 25°C100,000 hours
ATX-Mainboard (20+4-pin)Yes
PCI-Express (6+2-pin)1 4
P8-/P4-connector1x P4+4
SATA Connectors4 5 6
Molex Connectors2 3
Floppy Connectors1
Warranty24 months
EAN barcode4260052185292 4260052185315 4260052185339 4260052185346

Product Resources

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 satisfied customer”

“Found staff to be very helpful in putting my order together, the computer was delivered when they said it would, and well packaged. Computer really was exceptionally quiet and powerful - exactly what I was after. No hesitation in recommending Quiet PC.com.”

7th May 2019 via Trustpilot