be quiet! System Power 11 450W ATX PSU Black

be quiet! System Power 11 450W | ATX 3.1 Entry-Level PSU

The be quiet! System Power 11 450W power supply unit 20+4 pin ATX ATX Black is built for value-oriented PC builders who refuse to compromise on reliability. It targets users assembling efficient office rigs, entry-level gaming setups, or home workstations. This unit delivers proven stability with a focus on quiet operation. It features ATX 3.1 compatibility and a temperature-controlled fan. Consequently, it offers a solid foundation for modern, low-power systems without unnecessary noise.

Slim Specs Table

ATX 3.1 and PCIe 5.1 Compatibility

This PSU meets the latest ATX 3.1 and EPS 2.92 standards. It is designed to handle power excursions common with modern graphics cards. Because it supports the new specification, it provides better stability for transient loads. You can build with confidence, knowing the unit is ready for current and near-future hardware requirements.

Quiet, Efficient Cooling

The unit uses a 12 cm rifle-bearing fan with a speed range of 0–1800 RPM. It operates at a noise level of just 19.1 dB, which is virtually silent at low loads. The active cooling system is temperature-controlled, so the fan only spins up when necessary. This design reduces dust buildup and extends the fan’s lifespan.

Robust Power Delivery and Protection

It provides a strong +12V rail delivering 450 W combined power, sufficient for mid-range components. The PSU includes comprehensive protection features: Over current, Over power, Over voltage, Overheating, Short circuit, Surge & inrush, and Under voltage. With a hold time of 16.86 ms, it maintains system stability during brief power interruptions.

Practical Connectivity and Cabling

The be quiet! System Power 11 450W uses a non-modular cabling system. It includes a 20+4 pin ATX motherboard connector and a 4+4 pin CPU connector. For graphics, you get two PCI Express 6+2 pin connectors. It also provides five SATA power connectors and one peripheral Molex connector for drives and accessories.

Sustainable and Compliant Design

This power supply holds several compliance certificates, including CE, RoHS, TÜV mark, and UKCA. It is also ENERGY STAR and ErP certified, indicating low standby power consumption. The unit meets WEEE standards for waste electrical equipment. Always verify your region’s specific compliance marks for import or business use.

Box contents

• be quiet! System Power 11 450W power supply unit
• AC power cord
• Screws included
• Cable ties included

Check before you buy

• Confirm your case supports ATX PSU dimensions (150 x 86 x 140 mm).
• Verify your motherboard has a 20+4 pin ATX and 4+4 pin CPU connector.
• Check your graphics card requires no more than two 6+2 pin PCIe connectors.
• Ensure your local mains voltage matches the PSU’s 200–240 V AC input range.

Frequently Asked Questions

Q: Is this power supply suitable for a gaming PC?

A: Yes, for entry-level to mid-range builds with GPUs using up to two PCIe connectors.

Q: Does it come with a UK plug?

A: The input is 200-240V, but the specific plug type is not specified. Confirm with the retailer.

Q: Is the cabling modular?

A: No, this is a non-modular PSU; all cables are permanently attached.

Q: What is the warranty period?

A: Warranty length is not specified. Please check with Hardvance or be quiet! for UK terms.

Q: Is this PSU compatible with UKCA marking?

A: Yes, the product lists UKCA among its compliance certificates.

The Consultant’s verdict & warranty

This unit is ideal for UK builders constructing a reliable, quiet, and efficient PC on a budget. It suits office systems, home servers, and entry-level gaming rigs where 450 W is sufficient. Choose this for proven stability and quiet operation without premium features. Covered by the standard Manufacturer Warranty.