be quiet! Pure Power 12 550W PSU – ATX 3.1, PCIe 5.1 and 80 PLUS Gold

The be quiet! Pure Power 12 550W Power Supply is a quiet, efficient and modern ATX PSU designed for gaming PCs, home computers, workstations and content-creation systems. It delivers 550 watts of continuous power through a strong single 12V rail and supports the latest ATX 3.1 and PCIe 5.1 power standards.

A native 12V-2x6 graphics-card connector rated for up to 300W provides direct power for compatible PCIe 5.1 graphics cards, while two conventional PCIe 6+2-pin connectors support a wide range of existing AMD and NVIDIA GPUs. This combination makes the PSU suitable for both current PC builds and carefully planned future upgrades.

The Pure Power 12 550W is certified 80 PLUS Gold and reaches up to 92.4% efficiency at 230V. Higher efficiency reduces the energy lost as heat, helping the PSU operate cooler and allowing its temperature-controlled 120mm be quiet! fan to remain exceptionally quiet during normal use.

This is a fully wired, non-modular ATX power supply. The motherboard and 12V-2x6 cables use black sleeving, while the remaining flat black cables help simplify routing and maintain an organised PC interior.

The exact European model is BP001EU, with EAN 4260052191163. It is protected by a comprehensive range of electrical safety circuits and supplied with a ten-year be quiet! manufacturer warranty.

Key Features of the be quiet! Pure Power 12 550W

• 550W continuous output for compatible gaming, work and everyday desktop PCs
• 600W listed peak output
• ATX 3.1 compliant for modern desktop power requirements
• EPS 12V 2.92 support
• PCIe 5.1 compatible with a native 12V-2x6 GPU cable
• One 12V-2x6 connector rated for up to 300W
• Two PCIe 6+2-pin connectors for conventional graphics cards
• 80 PLUS Gold certification
• Up to 92.4% efficiency at 230V
• Single high-performance 12V rail delivering up to 550W
• 45.8A available on the 12V rail
• LLC + synchronous rectification + DC-to-DC topology
• 120mm temperature-controlled be quiet! fan
• Maximum fan speed of 1800 RPM
• Manufacturer-rated noise of only 14.6dB(A) at full load
• Handles short ATX 3.1 power excursions without treating them as continuous output
• Modern Standby support
• Less than 0.1W standby power consumption
• Non-modular, permanently attached cables
• Five SATA power connectors
• One PATA/Molex power connector
• Full electrical protection suite
• Ten-year manufacturer warranty

550W Continuous Power for Balanced PC Builds

The Pure Power 12 provides 550 watts of continuous output. Continuous output is the amount of power the PSU is designed to provide over sustained operation, rather than only for a brief peak.

This wattage can be suitable for many carefully balanced systems, including:

• Home and office desktop computers
• Mid-range gaming PCs
• Systems using energy-efficient modern processors
• Gaming computers with a compatible mid-range graphics card
• Photo-editing and general content-creation PCs
• Media-centre and entertainment computers
• Quiet productivity systems
• Upgrades from an older or less efficient PSU

Whether 550W is sufficient depends on the complete system. The graphics card, processor, motherboard, storage, cooling, lighting, USB devices and any overclocking must all be considered.

Check the Required PSU Wattage Before Ordering

Before choosing this power supply, check:

• The graphics-card manufacturer's recommended PSU wattage
• The GPU power-connector requirement
• The processor's expected power consumption
• The number of storage drives and accessories
• Whether the CPU or GPU will be overclocked
• Whether future upgrades will require additional capacity
• The number and type of motherboard power connectors

The PSU wattage recommendation printed by a graphics-card manufacturer normally assumes a complete system rather than the graphics card alone. Always follow the higher requirement where the GPU or system manufacturer recommends more than 550W.

ATX 3.1 Power-Supply Standard

The be quiet! Pure Power 12 550W complies with the ATX 3.1 specification. ATX 3.1 is designed for modern desktop systems and includes updated requirements for power delivery, electrical behaviour and short-duration load changes.

Modern processors and graphics cards can change power consumption very quickly. A PSU must respond to these changes while maintaining stable output to the connected components.

Designed to Handle Short Power Excursions

be quiet! states that the Pure Power 12 can handle short power excursions of up to twice its rated output under the relevant ATX 3.1 conditions. This supports stable operation when a compatible graphics card briefly demands substantially more power than its normal level.

This does not mean the PSU is an 1100W power supply. Its continuous output remains 550W, and its separately listed peak output is 600W. Transient capability refers only to very short power events defined by the ATX standard.

PCIe 5.1 Compatibility and Native 12V-2x6 Cable

The PSU includes a native PCIe 5.1 12V-2x6 graphics-card cable. The 12V-2x6 connector is the revised high-power GPU connection associated with the ATX 3.1 and PCIe 5.1 standards.

For this 550W model, be quiet! officially rates the 12V-2x6 output at up to 300W. It must not be described as a 600W GPU cable.

Which Graphics Cards Can Use the 12V-2x6 Connector?

The connector can be used with a compatible graphics card that has a matching 12V-2x6 or supported high-power GPU socket and whose power requirements are within the limits of the PSU and cable.

Before installation, check all of the following:

• The exact graphics-card model
• The card manufacturer's PSU recommendation
• The required connector type
• The card's stated power consumption
• Whether the 300W cable rating is sufficient
• The total power required by the complete PC

Some high-end graphics cards require substantially more than 300W or recommend a power supply rated well above 550W. A physical connector match alone does not confirm that the PSU has enough capacity.

Correct 12V-2x6 Installation

The 12V-2x6 plug should be inserted fully and evenly into the graphics-card socket. A partially connected plug can create poor electrical contact.

• Switch off and unplug the PC before installation
• Insert the connector until it is fully seated
• Check that the plug is straight and secure
• Do not force the cable sharply against the connector
• Allow sufficient space between the graphics card and case side panel
• Do not use unapproved extension cables or adapters
• Recheck the connector after routing the cable

Two PCIe 6+2-Pin Graphics-Card Connectors

In addition to the native 12V-2x6 cable, the Pure Power 12 550W provides two PCIe 6+2-pin connectors. These connectors support many graphics cards that use conventional six-pin or eight-pin PCIe power inputs.

The detachable two-pin section allows each 6+2 connector to be used as either:

• A six-pin PCIe connector
• An eight-pin PCIe connector

Check the graphics card carefully before connecting power. CPU/EPS and PCIe connectors can appear similar but use different pin arrangements and must not be interchanged.

80 PLUS Gold Efficiency

The Pure Power 12 550W is certified 80 PLUS Gold. PSU efficiency describes how much power drawn from the wall is converted into usable DC power for the computer.

Higher efficiency means that less electricity is lost as waste heat. This can contribute to:

• Lower internal PSU temperatures
• Reduced fan demand
• Quieter operation
• Lower unnecessary energy loss
• Reduced heat released into the PC case

Manufacturer-Listed Efficiency at 230V

• 20% load: 90.9% efficiency
• 50% load: 92.4% efficiency
• 100% load: 91.2% efficiency

These figures are based on be quiet!'s test conditions at 230V. Actual efficiency and electricity use depend on the connected system, workload, input voltage and operating environment.

Efficiency Does Not Reduce the 550W Output

A 550W power supply can provide up to its rated DC output to the computer. The efficiency percentage relates to the amount of AC power drawn from the wall to produce that output.

For example, the PSU may draw more than 550W from the wall when supplying a very high DC load because some energy is lost during conversion. The difference is primarily released as heat.

Exceptionally Quiet 120mm Cooling Fan

The PSU uses a 120mm silence-optimised be quiet! fan. The fan is temperature-controlled so that its speed changes according to the PSU's cooling requirements.

Airflow-optimised fan blades are designed to reduce turbulence while moving cooling air through the PSU. This helps balance thermal performance with low operating noise.

Official Fan and Noise Specifications

• Fan size: 120mm
• Bearing technology: Rifle bearing
• Motor: Four-pole fan motor
• Maximum fan speed: 1800 RPM
• Noise at 10% load: 9.0dB(A)
• Noise at 20% load: 9.2dB(A)
• Noise at 50% load: 9.4dB(A)
• Noise at 100% load: 14.6dB(A)

Actual audible noise can vary depending on case construction, room acoustics, ambient temperature, system load, PSU orientation and distance from the computer.

No Zero-RPM Mode

The official specification does not list a semi-passive or zero-RPM mode. The fan is temperature-controlled and designed for very quiet continuous cooling rather than stopping completely at low load.

LLC, Synchronous Rectification and DC-to-DC Technology

The Pure Power 12 uses an LLC + SR + DC/DC topology. These technologies are designed to support efficient conversion, stable voltage output and reliable operation across changing workloads.

LLC Topology

The LLC resonant design helps improve power-conversion efficiency and voltage regulation on the primary side of the PSU.

Synchronous Rectification

Synchronous rectification is used for efficient conversion of the main 12V output.

DC-to-DC Conversion

The 3.3V and 5V outputs are generated from the main 12V rail using DC-to-DC conversion. This supports more stable regulation in modern computers where the CPU and graphics card place significant demand on the 12V output.

Strong Single 12V Rail

The PSU uses one high-performance 12V rail rated at 45.8A, with up to 550W combined 12V output.

The 12V rail supplies major components such as:

• The processor through the CPU/EPS cable
• The graphics card through PCIe power cables
• Storage devices through the PSU's conversion circuitry
• Fans, pumps and other connected equipment

Output-Rail Information

• +3.3V: 20A
• +5V: 20A
• +12V: 45.8A
• -12V: 0.3A
• +5V standby: 3A
• Combined +3.3V and +5V output: 120W
• Combined +12V output: 550W
• 12V-2x6 connector output: Up to 300W

Fully Wired Non-Modular Design

The Pure Power 12 550W is a non-modular PSU. All power cables are permanently attached to the unit.

This design means that every supplied cable remains connected, even when a particular connector is not required by the system. Unused cables should be routed and secured inside the PSU shroud or another appropriate case-management area.

Benefits of a Non-Modular PSU

• No detachable PSU-side connections to install
• No risk of mixing incompatible modular cable sets
• All required standard cables are already attached
• Often a lower purchase cost than an equivalent modular model

Important Cable Compatibility Warning

Never connect modular cables from another PSU to this power supply or use cables intended for another brand or model. Modular PSU cable pinouts are not universally standardised.

The Pure Power 12 550W is fully wired and should be used only with its permanently attached power cables.

Black Sleeved and Flat Cables

The motherboard and 12V-2x6 cables use black sleeving. The remaining premium black cables use a flat design to help with routing around the motherboard tray, storage cages and PSU shroud.

Careful cable management can improve:

• Airflow through the computer case
• Access to components
• The appearance of a windowed PC
• Ease of future cleaning and maintenance

Do not pull cables tightly, crush them beneath panels or bend them sharply near the connector.

Motherboard and CPU Power Connections

The PSU includes:

• 1 × 20+4-pin ATX motherboard connector
• 1 × 4+4-pin CPU/EPS connector

The 20+4-pin connector supports standard 24-pin ATX motherboard sockets and selected older 20-pin designs where appropriate.

The CPU cable separates into two four-pin sections, allowing it to connect to a compatible four-pin or eight-pin CPU power socket.

No Additional Separate 8-Pin CPU Cable

be quiet!'s official connector table lists one 4+4-pin CPU connector and does not list an additional separate P8 CPU cable for this 550W model.

Motherboards requiring both an eight-pin CPU connection and an additional four-pin or eight-pin auxiliary CPU connection should be checked carefully before purchase.

Storage and Peripheral Power Connectors

The Pure Power 12 550W includes:

• 5 × SATA power connectors
• 1 × four-pin PATA/Molex connector

SATA Power Uses

SATA power connectors can be used with compatible:

• 2.5-inch SATA SSDs
• 3.5-inch SATA hard drives
• Optical drives
• Selected fan and RGB controllers
• Compatible case accessories

PATA/Molex Power Uses

The four-pin PATA connector can power selected older drives, fan controllers, pumps, lighting accessories and other compatible peripherals.

Do not exceed the electrical limits of a cable by connecting an excessive number of splitters or high-power accessories.

Comprehensive Electrical Protection

The Pure Power 12 includes multiple protective circuits designed to shut down or limit the PSU when unsafe electrical conditions are detected.

Included Protection Features

• OCP – Over-Current Protection: protects against excessive current draw
• OVP – Over-Voltage Protection: protects against excessive output voltage
• UVP – Under-Voltage Protection: protects against output voltage falling below a defined threshold
• SCP – Short-Circuit Protection: shuts down the PSU if a short circuit is detected
• OPP – Over-Power Protection: protects the PSU against excessive total load
• OTP – Over-Temperature Protection: protects against excessive internal temperature
• SIP – Surge and Inrush Protection: helps protect against mains surges and limits initial inrush current

Protection circuits reduce risk but cannot guarantee that connected hardware will survive every electrical event. A suitable surge protector or uninterruptible power supply may provide additional protection against external mains problems.

Modern Standby and Low Standby Consumption

The PSU supports Modern Standby, allowing compatible systems to use supported low-power standby and rapid-wake functions.

be quiet! lists standby power consumption at less than 0.1W. Actual whole-system standby consumption depends on the motherboard, operating system, network hardware, USB devices and BIOS settings.

Universal 100–240V AC Input

The PSU accepts an input range of 100–240V AC at 50–60Hz. It uses active power-factor correction, with a listed power factor above 0.98 at full load.

The correct regional mains lead and electrical outlet must be used. Never open the PSU casing or attempt internal repairs, even after it has been disconnected, because internal capacitors can retain a dangerous electrical charge.

ATX PSU Dimensions and Case Compatibility

The Pure Power 12 550W measures approximately:

• Length: 160mm
• Width: 150mm
• Height: 86mm
• Weight: Approximately 2.18kg

The case must support a standard ATX power supply and provide sufficient space for the 160mm PSU length, permanently attached cables and cable bend radius.

Check More Than the Advertised PSU Clearance

A case may state that it supports a 160mm or longer PSU, but internal drive cages, cable openings or front-mounted radiators can reduce the usable space.

Before ordering, check:

• The case's maximum PSU length
• Space for the permanently attached cables
• The position of any hard-drive cage
• The location of bottom air vents and dust filters
• Whether a front radiator reduces PSU space
• The required fan orientation

Correct PSU Fan Orientation

When the case has a filtered lower PSU vent, the fan is normally positioned facing down so that it draws cool air from outside the case.

If the case has no lower ventilation opening, the fan may need to face upwards into the case. Follow the computer-case manual and ensure that the PSU air intake and rear exhaust are not obstructed.

Do not place the PC directly on thick carpet if this blocks a downward-facing PSU intake.

Average Service-Life Rating

be quiet! lists an average PSU lifetime of more than 100,000 hours at 25°C. This is a manufacturer reliability rating under specified conditions rather than a guaranteed operating duration.

Actual service life depends on:

• Operating temperature
• System load
• Dust accumulation
• Ventilation and fan condition
• Mains-power quality
• Environmental humidity
• Component ageing

Operating Temperature

The manufacturer lists an operating temperature of up to 40°C. Good case ventilation is important because high internal temperatures can increase fan speed and place additional thermal stress on the PSU.

Keep the PSU intake, exhaust grille and case dust filter clean. Never cover the PSU ventilation openings.

Who Is the Pure Power 12 550W Best For?

• Users building a quiet home or office desktop PC
• Gamers assembling a balanced mid-range system
• Users requiring native 12V-2x6 support up to 300W
• PCs using a conventional GPU with one or two PCIe 6+2-pin connections
• Content creators using a moderately powered workstation
• Customers replacing an older, inefficient power supply
• Users wanting 80 PLUS Gold efficiency
• Builders who prefer a single 12V-rail design
• Customers who value quiet cooling and a long warranty
• Systems requiring up to five SATA power connections

Who May Need a Different Power Supply?

This 550W model may not be suitable for:

• Graphics cards whose manufacturer recommends more than 550W
• GPUs requiring more than 300W through the 12V-2x6 connector
• Multi-GPU systems
• Extreme CPU and GPU overclocking
• Workstations with several high-power components
• Motherboards requiring two separate CPU/EPS power cables
• Users who require a fully modular PSU
• Small-form-factor cases requiring an SFX or SFX-L PSU
• Cases that cannot accommodate a 160mm-long power supply and fixed cables
• Systems requiring more than five SATA connectors

How to Check Compatibility Before Ordering

1. Check the graphics-card manufacturer's recommended PSU wattage.
2. Confirm whether the GPU uses 12V-2x6 or PCIe 6+2-pin power.
3. Check that the GPU power requirement does not exceed the connector rating.
4. Calculate the approximate power requirement of the full system.
5. Confirm that the motherboard uses a standard 20+4-pin ATX connection.
6. Check whether one 4+4-pin CPU connector is sufficient.
7. Count the required SATA and PATA power connections.
8. Confirm that the case supports a standard ATX PSU.
9. Check that the case has space for a 160mm-long PSU and fixed cables.
10. Consider planned CPU, GPU or storage upgrades.

Basic Power-Supply Installation Guidance

A PSU should be installed carefully because incorrect wiring can prevent the computer from starting or damage components.

1. Switch off the computer and unplug it from mains power.
2. Press the PC power button briefly to help discharge residual system power.
3. Use suitable anti-static precautions.
4. Secure the PSU to the case using the correct mounting screws.
5. Connect the 20+4-pin cable to the motherboard.
6. Connect the 4+4-pin CPU/EPS cable near the processor socket.
7. Connect the correct PCIe or 12V-2x6 cable to the graphics card.
8. Connect SATA or PATA power to compatible drives and accessories.
9. Route cables without crushing, stretching or sharply bending them.
10. Check every connection before restoring mains power.

Do Not Confuse CPU and PCIe Power Cables

The CPU/EPS and PCIe GPU connectors may appear similar, but their electrical pin arrangements are different. Use only the connector marked for the intended component.

Never force a connector into a socket. If it does not fit naturally, stop and check the label, shape and orientation.

be quiet! Pure Power 12 550W Technical Specifications

• Brand: be quiet!
• Product Series: Pure Power 12
• Model: Pure Power 12 550W
• Manufacturer Part Number: BP001EU
• Memox SKU: PSBEQ-BP001EU
• EAN: 4260052191163
• Product Type: Desktop PC power supply
• PSU Form Factor: ATX
• ATX Standard: ATX 3.1
• EPS Standard: EPS 12V 2.92
• PCIe Standard: PCIe 5.1 compatible
• Continuous Output: 550W
• Peak Output: 600W
• 80 PLUS Certification: Gold
• Maximum Listed Efficiency: 92.4% at 230V and 50% load
• Efficiency at 20% Load: 90.9%
• Efficiency at 50% Load: 92.4%
• Efficiency at 100% Load: 91.2%
• Topology: LLC + synchronous rectification + DC/DC
• Digital Control: No
• 12V Rail Design: Single rail
• +12V Output: 45.8A / 550W
• +3.3V Output: 20A
• +5V Output: 20A
• Combined +3.3V and +5V Output: 120W
• -12V Output: 0.3A
• +5V Standby Output: 3A
• 12V-2x6 Maximum Output: 300W
• Input Voltage: 100–240V AC
• Input Frequency: 50–60Hz
• Input Current: 10A / 5A
• Power Factor at Full Load: Greater than 0.98
• Modern Standby: Supported
• Standby Consumption: Less than 0.1W
• Hold-Up Time at 100% Load: 16.6ms
• Hold-Up Time at 80% Load: 20.2ms
• Power-Good Signal: 100–150ms
• Cooling Fan: 120mm temperature-controlled be quiet! fan
• Fan Bearing: Rifle bearing
• Fan Motor: Four-pole motor
• Maximum Fan Speed: 1800 RPM
• Noise at 10% Load: 9.0dB(A)
• Noise at 20% Load: 9.2dB(A)
• Noise at 50% Load: 9.4dB(A)
• Noise at 100% Load: 14.6dB(A)
• Modular Cabling: No, fully wired
• Number of Permanently Attached Cables: 6
• Motherboard Cable: 1 × 20+4-pin ATX
• CPU Cable: 1 × 4+4-pin CPU/EPS
• Additional Separate P8 CPU Cable: No
• PCIe 5.1 Cable: 1 × 12V-2x6, up to 300W
• Conventional GPU Connectors: 2 × PCIe 6+2-pin
• SATA Connectors: 5
• PATA/Molex Connectors: 1
• Floppy Connector: No
• Protection Circuits: OCP, OVP, UVP, SCP, OPP, OTP and SIP
• Operating Temperature: Up to 40°C
• Average Lifetime: More than 100,000 hours at 25°C
• Dimensions: 160 × 150 × 86mm
• Net Weight: Approximately 2.18kg
• Colour: Black
• Certifications: Includes CE, TÜV and UKCA
• Environmental Compliance: Energy Star 8.0, ErP, WEEE and RoHS
• Manufacturer Warranty: 10 years

What Is Included?

• 1 × be quiet! Pure Power 12 550W power supply
• Permanently attached motherboard, CPU, GPU and drive cables
• PSU mounting screws
• Cable ties
• User documentation

A motherboard, processor, graphics card, computer case and other PC components are not included.

Important Graphics-Card Compatibility Information

The presence of a 12V-2x6 connector does not mean this 550W PSU is suitable for every PCIe 5.1 graphics card. The connector is rated for up to 300W, and the complete system must remain within the PSU's continuous output capacity.

Always check the exact GPU manufacturer's recommended PSU wattage and connector requirements before ordering.

Important Non-Modular Cable Information

This is a non-modular, fully wired power supply. The cables cannot be disconnected from the PSU.

Do not attempt to connect modular PSU cables from any other power supply. Cable compatibility cannot be determined by connector shape alone.

Important Electrical Safety Information

A PC power supply contains hazardous high-voltage components. Never open the PSU casing, insert objects through the ventilation openings or attempt internal repair.

Disconnect the computer from mains power before installing or changing components. If you are uncertain about PSU installation, use an experienced PC technician.

Why Choose the be quiet! Pure Power 12 550W?

The be quiet! Pure Power 12 550W combines modern ATX 3.1 power delivery, PCIe 5.1 compatibility and 80 PLUS Gold efficiency in a quiet and dependable ATX power supply.

Its native 300W 12V-2x6 connection supports compatible newer graphics cards, while two PCIe 6+2-pin connectors maintain compatibility with many established GPU designs. The powerful single 12V rail, LLC-based topology and comprehensive protection circuits support stable operation across gaming, productivity and everyday workloads.

The temperature-controlled 120mm fan is rated at only 14.6dB(A) even at full load under manufacturer test conditions, while efficiency reaches up to 92.4% at 230V. Black sleeved and flat cables help maintain a tidy internal layout, although buyers should understand that the PSU is fully wired rather than modular.

Choose the Pure Power 12 550W when you need a quiet, efficient and modern 550W ATX 3.1 power supply, have confirmed that its wattage and connector arrangement suit your complete PC, and value the reassurance of a ten-year be quiet! manufacturer warranty.