be quiet! Pure Power 550W PSU

be quiet! Pure Power 13 M 550W | Gold Efficiency ATX 3.1 PSU

The be quiet! Pure Power 13 M 550W delivers ATX 3.1 compliance and PCIe 5.1 compatibility in a fully-modular, semi-passive design built for UK PC builders seeking exceptional quiet operation and dependable power delivery.

Whisper-quiet operation with semi-passive cooling

The Pure Power 13 M 550W features a 120mm rifle bearing fan with semi-passive cooling that remains off during low to medium loads. This delivers noise levels as low as 20.8 dB, making it ideal for silent home offices, media centres, and gaming rigs where acoustic performance matters.

Future-proof ATX 3.1 and PCIe 5.1 compatibility

Built to the latest ATX 3.1 standard with EPS 2.92 compliance, this PSU handles modern multi-rail power delivery demands. The included PCIe 5.1 cable ensures compatibility with next-generation graphics cards, while the two PCIe 6+2 connectors support current high-end GPUs without compromise.

Gold efficiency meets comprehensive protection

With 92.1% efficiency under typical loads, the 80 PLUS Gold certification reduces electricity waste and heat output. Multiple protection features include over current, over power, over voltage, overheating, short circuit, surge & inrush protection (SIP), and under voltage safeguards for reliable operation.

Fully modular cabling for clean builds

The fully-modular design lets you connect only the cables you need, reducing clutter inside your case. Included cables cover all standard connections: ATX 20+4-pin motherboard, dual CPU 4+4-pin, five SATA, two Molex, and both PCIe 6+2 and PCIe 5.1 connectors for maximum flexibility.

Box contents

• be quiet! Pure Power 13 M 550W PSU
• ATX 20+4-pin power cable
• CPU 4+4-pin power cables (2)
• PCIe 6+2-pin power cables (2)
• PCIe 5.1 power cable (1)
• SATA power cables
• Peripheral (Molex) power cables
• AC power cable
• Mounting screws
• Cable ties

Check before you buy

• Confirm your case has sufficient space (150 x 160 x 86 mm)
• Verify your graphics card requires PCIe 5.1 or 6+2 connectors
• Check total system power draw against 550W capacity
• Ensure your motherboard uses standard 20+4 pin ATX connector

Frequently Asked Questions

Q: Is this PSU compatible with older ATX motherboards?

A: Yes, the 20+4 pin ATX connector works with both older and modern motherboards.

Q: Does the semi-passive mode work with all systems?

A: The fan remains off during low to medium loads, activating only when higher cooling is needed.

Q: Can this power a high-end gaming PC?

A: The 550W capacity suits mid-range to high-end systems, but verify your GPU’s power requirements first.

Q: What protection features does this PSU include?

A: It includes over current, over power, over voltage, overheating, short circuit, surge & inrush protection, and under voltage protection.

Q: Is the warranty valid in the UK?

A: Yes, this PSU includes UKCA certification and is covered by the standard manufacturer warranty.

The Consultant’s verdict & warranty

The be quiet! Pure Power 13 M 550W represents excellent value for UK builders prioritising silent operation without sacrificing modern compatibility. Its ATX 3.1 compliance, PCIe 5.1 support, and fully-modular design make it suitable for both current and next-generation systems. Covered by the standard manufacturer warranty.