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Straight Power 10 CM 800W Modular PSU, BN237
Straight Power 10 CM 700W Modular PSU, BN236
Straight Power 10 CM 600W Modular PSU, BN235
Straight Power 10 CM 500W Modular PSU, BN234
More variations available Show

Be Quiet Straight Power 10 CM Modular PSUs

The be quiet Straight Power 10 PSUs offer a plethora of features and exceptionally low operational noise.

The Straight Power 10 are a high-quality series of power supplies from be quiet!, with extensive options and whisper-quiet operation. Designed to offer a broad spectrum of performance and features, it is adapted to handle the requirements of mid-line to high-performance PC systems. The series is especially well suited for gaming and multimedia, power-hungry graphics applications and entertainment PCs.


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

The Straight Power 10 CM power supplies provides a new level of silent performance for systems that demand whisper-quiet operation without facing the slightest compromise in power quality. Our German team has updated and designed even more premium features into this generation of the Straight Power series, which make the Straight Power 10 700W CM more silent than ever and a clear ‘Best Choice’ for new systems and as a replacement in existing systems.

Virtually Inaudible Operation

  • Installed SilentWings 3 135mm fan includes a wide array of electronic and mechanical optimisations for best-of-class airflow with very low noise production, including: unique airflow-optimised fan blade design reduces noise-generating fan turbulence, advanced fluid-dynamic bearing with copper core provides for greatly reduced operating noise and super-long life and 6-pole fan motor with high-quality IC controller reduces electrical noise, power consumption, and vibration. Lower starting voltage of the fan reduces significantly the starting fan speed and noise level at low load conditions.
  • Funnel-shaped fan opening of the PSU case is significant big and allows high airflow intake.
  • SilentWings 3 fan is decoupled from the PSU body with special mount, further reducing transmission of vibration and noise.
  • Optimised PSU airflow design generates superior cooling at lower fan speeds and reduces turbulence around components, thus allowing even quieter operation.
  • Variable fan speed is optimally governed to strike the best balance between proper cooling and deep quietness.

Energy Efficiency

  • 80PLUS Gold certification independently verifies the extremely high operating efficiency (up to 93%) of this design.
  • High efficiency means money savings, because your PC draws less power from the mains to do its work. This means less waste heat, less cooling required, and overall quieter operation.
  • Standby drain of less than 0.25 Watts (</= 0.15W).
  • Meets Energy Star 6.0 guidelines.
  • Fulfils ErP 2014 guidelines.
  • Zero Load design supports Intel’s Deep Power Down C6 and C7 modes.


  • Improved integrated circuit power conversion design features Active Clamp and Synchronous Rectifier (SR) technology plus DC-to-DC voltage step-down for amazing signal stability, voltage regulation (main output rails are
  • Premium quality capacitors rated to 105°C for maximum performance, reliability and operating life.
  • Full suite of top safety protections defends against over-currents, over- and under-voltages, short circuits, overheating and overloads, thus safeguarding your valuable components.
  • Four independent 12V-rails improve power signal stability.

Maximum Compatibility and Convenience

  • Professional modular cable management system with removable cable bundles simplifies component installation, reduces annoying clutter, increases airflow and allows for improved cooling.
  • Sleeved cable lengths up to 115cm allow for improved cooling and are perfect for large PC cases.
  • Connectors are compatible with older components as well as those still on the drawing board.
  • Individual P4 and P8 plugs on longer cables support all common mainboard types and allow routing behind motherboards for improved airflow.
  • Four PCIe connectors for powerful multi-GPU configurations.
  • Clearly labelled plugs and clever accessories promote simple installation.

Show specifications and reviews for:
SpecificationsSP 10 500W CM BN234SP 10 600W CM BN235SP 10 700W CM BN236SP 10 800W CM BN237
Model NumberBN234 BN235 BN236 BN237
Power500W 600W 700W 800W
ModularYes Yes Yes Yes
+3.3V maximum output current24 A 24 A 25 A 25 A
+5V maximum output current24 A 24 A 25 A 25 A
+12V1 maximum output current18 A 18 A 18 A 20 A
+12V2 maximum output current18 A 18 A 18 A 20 A
+12V3 maximum output current18 A 20 A 22 A 24 A
+12V4 maximum output current18 A 20 A 22 A 24 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)160 x 150 x 86mm 160 x 150 x 86mm 160 x 150 x 86mm 160 x 150 x 86mm
Noise level at 20% load10.3 dBA 10.6 dBA 10.5 dBA 10.7 dBA
Noise level at 50% load10.7 dBA 10.9 dBA 11.3 dBA 11.1 dBA
Noise level at 100% load15.0 dBA 20.2 dBA 23.3 dBA 29.5 dBA
80PLUS CertificationGold Gold Gold Gold
Active PFCYes Yes Yes Yes
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)2 4 4 4
P8-/P4-connector1x P4+4 1x P4+4 1x P4+4 1x P4+4
SATA Connectors9 9 11 11
Molex Connectors3 3 4 4
Floppy Connectors1 1 1 1
Warranty24 months 24 months 24 months 24 months
EAN barcode4260052183670 4260052183687 4260052183694 4260052183700
SpecificationsSP 10 500W CM BN234SP 10 600W CM BN235SP 10 700W CM BN236SP 10 800W CM BN237
Model NumberBN234 BN235 BN236 BN237
Power500W 600W 700W 800W
+3.3V maximum output current24 A 25 A
+5V maximum output current24 A 25 A
+12V1 maximum output current18 A 20 A
+12V2 maximum output current18 A 20 A
+12V3 maximum output current18 A 20 A 22 A 24 A
+12V4 maximum output current18 A 20 A 22 A 24 A
Form factor ATX 12VVersion 2.4
Dimensions (LxWxH)160 x 150 x 86mm
Noise level at 20% load10.3 dBA 10.6 dBA 10.5 dBA 10.7 dBA
Noise level at 50% load10.7 dBA 10.9 dBA 11.3 dBA 11.1 dBA
Noise level at 100% load15.0 dBA 20.2 dBA 23.3 dBA 29.5 dBA
80PLUS CertificationGold
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)2 4
P8-/P4-connector1x P4+4
SATA Connectors9 11
Molex Connectors3 4
Floppy Connectors1
Warranty24 months
EAN barcode4260052183670 4260052183687 4260052183694 4260052183700

Product Resources


  • 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

“New PC from Quiet PC”

“I’d bought components from Quiet PC for over 10 years and always had great service, but never a complete PC. My last PC showed terminal symptoms so I ordered a Quiet PC Nofan A490S Skylake Silent Desktop, keeping my own monitor, speakers, keyboard and mouse. Boy, is it good! It is so fast with the Windows 10 operating system installed on the SSD drive and there is virtually no sound from the PC. Transferring my programs was less traumatic than expected, especially as I was going from an AMD to an Intel processor, and from 32-bit to 64-bit. The inside of the case shows the care with which the installation was carried out, with wiring tidy and unobtrusive. Delivery was well within the 7 day promise and the computer was well packaged. Now, my son - a professional music arranger and performer - and I each have Quiet PC silent PCs. We are both delighted with the service and the products.”

(Review via Trustpilot)