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header-product Power Supply Unit be quiet! System Power 11 550W
60.49 €

Power Supply Unit be quiet! System Power 11 550W

Fast delivery available
Power Supply Unit be quiet! System Power 11 Photo 1
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Power Supply Unit be quiet! System Power 11 Photo 1
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Power Supply Unit be quiet! System Power 11 Photo 3
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Power Supply Unit be quiet! System Power 11 550W

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Short description

The be quiet! System Power 11 550W power supply unit is designed for PC use, featuring a 20+4 pin ATX connector and non-modular cabling. It operates on an AC input voltage of 200-240V and a frequency of 50Hz. With an 80 PLUS Bronze certification, it ensures efficient power delivery. The active cooling system with a 12 cm fan keeps the unit cool, while its black color adds a sleek look. Compliance with multiple certificates ensures reliability and safety.
Available at price 60.49 €: 29 pcs.
Total available for order: 235 pcs.
Warranty: 2 Years
SKU: 11431559
Manufacturer: bequiet!
free shipment

Cheapest delivery:

Unisend LV

Pick-up points

Unisend LV

Cost

1.99 €

Deliver

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
09.10.2026 {{selectedOffer.officeDeliveryString}}
free
Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!
14.10.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 € (Weight: 2.37 kg)
Parcel couriers
Unisend LV / Venipak Pickup LV / Venipak Locker LV / DPD Paku skapis / Omniva LV / Latvijas Pasts pakomāts / Latvijas Pasts nodaļa
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From 1.99 €
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Product information

Description

The be quiet! System Power 11 550W power supply unit delivers reliable, quiet power for value-oriented PC builds. It supports ATX 3.1 via a 20+4 pin motherboard connector, comes with fixed (non-modular) cabling and features an active 120 mm fan for temperature-controlled cooling. The unit is 80 PLUS Bronze certified and designed for AC 200–240 V, 50 Hz operation; its black finish is suitable for most system interiors.

Advantages

The System Power 11 550W combines proven reliability with low-noise operation thanks to an intelligently controlled fan. With 80 PLUS Bronze efficiency (about 89.7% peak) and multiple safety certifications, it provides stable power delivery for everyday desktop and entry-level gaming systems. Non-modular cabling simplifies installation and the ATX 3.1 compatibility ensures modern motherboard support.

Suitable for

  • Home and office desktop PCs
  • Entry-level gaming systems
  • System upgrades requiring a 550 W PSU
  • Builds where quiet operation is preferred

Key specifications

  • Total power: 550 W
  • Efficiency: 89.7% (80 PLUS Bronze)
  • Motherboard connector: 20+4 pin ATX (ATX 3.1 compatible)
  • Input: AC 200–240 V, 50 Hz
  • Fan diameter: 120 mm, temperature-controlled
  • Cabling: fixed (non-modular)
  • Colour: Black
  • Weight: 1.92 kg

How to use

Install the PSU into a compatible ATX case following the motherboard and case manufacturer guidelines. Connect the 20+4 pin ATX cable to the motherboard and attach the required peripheral connectors to drives and other components. Ensure the AC mains voltage matches the PSU rating (200–240 V) and route cables to avoid obstructing airflow. During initial power-up, verify that system fans and components receive stable power and monitor temperatures.

Usage recommendations

For reliable, quiet operation maintain adequate case ventilation and avoid blocking the 120 mm fan. Use this 550 W unit for systems whose combined component power draw stays within the PSU’s rated capacity; consider headroom for future upgrades.

Specifications

80 PLUS certification:
80 PLUS Bronze
Power supply unit (PSU) form factor:
ATX
Purpose: What the product is used for.
PC
Peripheral (Molex) power connectors (4-pin): White 4-pinned connector used to connect a peripheral to the power supply.
1
Motherboard power connector: The way in which the motherboard is connected to the power supply.
20+4 pin ATX
AC input voltage: The voltage of the AC electricity that is inputted into the product.
200 - 240
Total power: The total power that is needed by the device, or the total power produced by the device.
550 W
All features

Other features

Cable ties included:
Yes
Screws included:
Yes

Logistics data

Shipping (inner) case width:
311 mm
Shipping (inner) case length:
556 mm
Shipping (inner) case height:
218 mm
Shipping (inner) case gross weight:
14900 g
Products per shipping (inner) case:
6 pc(s)

Technical details

Sustainability certificates:
ErP, ENERGY STAR

Packaging data

Package type: The type of product package e.g. box.
Box
Package weight: Weight of the packaged product.
2300 g
Package height: The distance from the top to the bottom of the packaging.
97 mm
Package depth: The distance from the front to the back of the packaging.
268 mm
Package width: The distance from one side of the packaging to the other.
195 mm

Weight & dimensions

Weight: Weight of the product without packaging (net weight). If possible, the net weight is given including standard accessories and supplies. Please note that sometimes the manufacturer leaves out the weight of accessories and/or supplies.
1.92 kg
Height: The measurement of the product from head to foot or from base to top.
140 mm
Depth: The distance from the front to the back of something.
86 mm
Width: The measurement or extent of something from side to side.
150 mm

Certificates

Waste Electrical and Electronic Equipment (WEEE) compliance:
Yes
Compliance certificates: Indicates which regulatory, safety, and environmental standards the product complies with, as verified by recognized authorities or certification bodies.
CB, WEEE, UKCA, CE, RoHS, TÜV mark

Design

On/off switch: The button which is pressed to switch the device on or off.
Yes
Fan speed:
0 - 1800
Number of fans: The quantity of fans (apparatus with rotating blades that creates a current of air for cooling or ventilation).
1 fan(s)
Fan diameter: The size of the fan, measured by the distance from one side of the fan to the other, via a straight line going through the middle of the fan.
120 mm
Cooling type: The method used to cool the device or to cool the air around the device.
Active
Product colour: The colour e.g. red, blue, green, black, white.
Black

Performance

Mean time between failures (MTBF): Statistical model used to indicate product/mechanism reliability; expressed in hours and percentage of duty cycle. This number (in hours) does not indicate the mean time before failure for a single unit/mechanism.
100000 h
Bearing technology:
Rifle
Noise level: The amplitude level of the undesired background noise, usually measured in decibels (db).
24.2 dB
EPS version:
2.92
ATX version: ATX (Advanced Technology eXtended) is a motherboard form factor specification developed by Intel in 1995. The specification defines the key mechanical dimensions, mounting point, I/O panel, power and connector interfaces between a computer case, a motherboard and a power supply. There are many versions of ATX including ATX12V 1.x and ATX12V v2.3.
3.1
80 PLUS certification:
80 PLUS Bronze
Power supply unit (PSU) form factor:
ATX
Purpose: What the product is used for.
PC

Ports & interfaces

Cabling type:
Non-Modular
CPU power connector (4+4 pin):
Yes
CPU P4 connector (4-pin):
1
PCI Express power connectors (12-pin):
1
PCI Express power connectors (6+2 pin):
2
Peripheral (Molex) power connectors (4-pin): White 4-pinned connector used to connect a peripheral to the power supply.
1
Number of SATA power connectors:
5
Motherboard power connector: The way in which the motherboard is connected to the power supply.
20+4 pin ATX

Power

Power protection features: Features that protect the device against power problems e.g. overload.
Over current, Over power, Over voltage, Overheating, Short circuit, Surge & inrush, Under voltage
Efficiency:
89.7 %
Hold time:
16.86 ms
Max output current (+5Vsb):
3 A
Max output current (-12V):
0.3 A
Max output current (+5V):
20 A
Max output current (+12V1):
45.83 A
Max output current (+3.3V):
20 A
Combined power (+5Vsb):
15 W
Combined power (-12V):
3.6 W
Combined power (+5V):
120 W
Combined power (+12V):
550 W
Combined power (+3.3V):
120 W
Power factor:
0.98
Input current:
4
AC input frequency:
50
AC input voltage: The voltage of the AC electricity that is inputted into the product.
200 - 240
Total power: The total power that is needed by the device, or the total power produced by the device.
550 W

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Stock data
Warehouse Stock Delivery to the store Store Price
EU58 10 20.10.2026
60.49 €
EU57 29 09.10.2026
60.49 € Best price
WH94 40 12.10.2026
62.49 €
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Available only for legal entities
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EU9 7 12.10.2026
69.49 €
WH109 29 26.10.2026
70.99 €
60.49 €
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60.49 €
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62.49 €
Stock: 40
Delivery Date: 12.10.2026
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62.99 €
Stock: 8
Delivery Date: 12.10.2026
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64.49 €
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64.99 €
Stock: 3
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64.99 €
Stock: 32
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66.49 €
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67.99 €
Stock: 5
Delivery Date: 07.10.2026
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Available only for legal entities
69.49 €
Stock: 7
Delivery Date: 12.10.2026
Warehouse: EU9
70.99 €
Stock: 29
Delivery Date: 26.10.2026
Warehouse: WH109

Customer reviews

Customer questions

FAQ

How much does the Power Supply Unit be quiet! System Power 11 cost, and is it available for purchase?

The price is 60.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 235 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 09.10.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All bequiet! products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized bequiet! service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: 80 plus certification, power supply unit (psu) form factor, purpose, peripheral (molex) power connectors (4-pin), motherboard power connector, ac input voltage, total power, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

Where can I download the instructions for Power Supply Unit be quiet! System Power 11?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.
warranty
14-Day Return Policy We are confident in our quality, but if the purchase doesn’t fit — you have 14 days to return the product with peace of mind.
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