be quiet! System Power 11 550w Power Supply
£48.98
Out of stock
PROVEN RELIABILITY, QUIET OPERATION
be quiet! System Power 11 550W
System Power 11 550W is built for value-oriented users who don’t want to compromise on reliability and quietness. With ATX 3.1 compatibility, PCIe 5.1 GPU support, and a temperature-controlled 120mm quality fan, it delivers stable, dependable power for systems of today and the ones to come.
80 PLUS® Bronze (up to 89.7%)
12V-2×6 300W + 2× PCIe 6+2
Stand-by drain < 0.15 watts
Core Highlights
- ATX 3.1 PSU with support for PCIe 5.1 GPUs and GPUs with 6+2 pin connectors
- One PCIe 5.1 12V-2×6 300W and 2 PCIe 6-2 connectors
- Temperature-controlled 120mm quality fan reduces system noise
- Tight voltage regulation using DC-to-DC technology
Future-Proof Your System
System Power 11 550W fulfills all ATX 3.1 specifications and comes with native integration of the 12V-2×6 connector for next-generation PCIe 5.1 graphics cards, plus PCIe 6+2-pin connectors for support of current-gen GPUs. It handles power excursions up to double its rated power with ease, making it a versatile choice for systems of today and the ones to come.
PCIe 5.1 Support
12V-2×6 300W
PCIe 6+2
Very Quiet Operation
Equipped with a temperature-controlled 120mm quality fan, System Power 11 550W delivers low noise operation and remarkable quietness at this price-level.
Temperature-Controlled
Reduces System Noise
Efficient Operation
With 80 PLUS® Bronze certification and an efficiency rating of up to 89.7%, System Power 11 550W delivers power saving operation. Stand-by drain of less than 0.15 watts helps keep energy use in check when your system is idle.
Up to 89.7% Efficiency
< 0.15W Stand-by Drain
Strong 12V Rail & Safety Protections
System Power 11 550W features rock-solid stability with a strong 12V-rail and provides stable and dependable power for CPU and GPU, ensuring steady operation even when your PC meets an unexpectedly heavy load. Safety protections defend against overcurrents, over- and undervoltages, overtemperature, short circuits and overloads to help keep valuable components safe.
Rock-Solid Stability
DC-to-DC Technology
General Specifications
Performance & Efficiency
Cooling & Acoustics
Power Rails & Output
Connectivity & Cables
Protection & Safety
Physical & Build
| Manual | |
| Datasheet | |
| Cables | JPG |
| Performance curve | JPG |
About be quiet!
be quiet! is a premium German PC hardware brand, recognised worldwide for designing high-performance components with an uncompromising focus on silence.
Founded in Germany, be quiet! has earned the trust of enthusiasts, gamers, creators and system builders the world over through exceptional build quality, reliability and near-silent operation.
German Engineering
Premium Components
Long Warranties
Designed in Germany
Every be quiet! product is engineered and quality-controlled in Germany, with meticulous attention to acoustics, airflow, thermals and long-term durability.
That engineering-first approach means each one performs exactly as intended: quietly and efficiently.
What be quiet! is known for
- Ultra-quiet, high-efficiency power supplies
- High-performance CPU coolers with silent operation
- Low-noise PC cases optimised for airflow and reduced vibration
- Premium fans engineered for strong airflow at minimal noise
Trusted by enthusiasts and professionals
be quiet! hardware is widely used in gaming PCs, professional workstations, content-creation systems, and quiet home and office builds.
As an authorised UK service centre, we supply genuine be quiet! products backed by full manufacturer warranty and local UK support.
Shipping & Delivery Information
Dispatch cut-off: 2:00pm
UK shipping only
- 🚚
UK mainland: Free standard next-day / 2-day delivery (subject to courier terms). - ⏱️
Same-day dispatch: Order before 2:00pm Monday–Friday. - 📍
Extended areas: Highlands, NI, ROI & Channel Islands typically 2–5 working days. - 🛑
No collection: We ship orders only.
Shipping Only
Please note that we do not offer collections. All orders are shipped via our courier partners.
Delivery services are subject to courier availability and local conditions.
Weekend Orders
Orders placed after 2:00pm on Friday or during the weekend
are processed on the next working day (normally Monday).
Bank holidays may also affect dispatch and delivery times.
UK Delivery
Free standard next-day / 2-day to UK mainland (subject to courier terms)
- ✅Free standard delivery on all orders
- 📦UK mainland only for next-day / 2-day services
- 🕑Cut-off: order before 2:00pm (Mon–Fri) for same-day dispatch
Extended Delivery Areas
Typically 2–5 working days
- 🏔️Scottish Highlands
- 🇬🇧Northern Ireland
- 🇮🇪Republic of Ireland
- 🏝️Channel Islands
Delivery times can vary depending on courier availability and local conditions.
International Shipping
We do not ship outside the UK
Delivery times are estimates and may be affected by courier delays outside of our control.
