be quiet! System Power 11 450W ATX 3.1 Bronze PSU
be quiet!
be quiet! System Power 11 450W ATX 3.1 Bronze PSU
The be quiet! System Power 11 450W ATX 3.1 Bronze PSU is designed for value-oriented PC builders who want reliable, quiet operation without paying a premium. It covers modern system requirements with ATX 3.1 compliance, PCIe 5.1 GPU support, and protection circuits that guard against the most common causes of component damage. A temperature-controlled fan and a standby draw of under 0.15 W keep it practical for everyday desktop use.
Why this product
ATX 3.1 ready for current and future GPUs
It meets the ATX 3.1 and PCIe 5.1 standards and can handle power excursions up to double its rated wattage, making it compatible with today's demanding graphics cards and the next generation.
Temperature-controlled 120mm fan
The rifle-bearing fan adjusts speed based on load, producing as little as 19.5 dB(A) at light load — quiet enough for a living-room or study build.
80 PLUS Bronze efficiency up to 89.0%
Certified 80 PLUS Bronze, it wastes less energy as heat under typical loads, reducing electricity draw and keeping the case cooler.
Comprehensive protection circuits
Over-current, over-voltage, under-voltage, over-power, over-temperature, short-circuit, surge and inrush protections are all present, guarding connected components against the most common fault conditions.
DC-to-DC technology for tight voltage regulation
A DC-to-DC conversion stage keeps rail voltages stable under variable loads, which helps sensitive CPUs and GPUs operate consistently during demanding workloads.
Five-year warranty
A 5-year warranty provides long-term coverage that exceeds many competing entry-level units in this power class.
- Power Output450W
- Efficiency80 PLUS Bronze (up to 89.0%)
- Form FactorATX
- ComplianceATX 3.1, EPS 12V v2.92
- Fan120mm, temperature-controlled
- Noise Level19.5 dB(A) at light load
- CablingNon-modular (fully wired)
- Warranty5 years
- SKUBEQ-708
- EAN4260052191859
- Compatible with ATX 3.1 motherboards and systems using the EPS 12V v2.92 CPU power standard.
- Supports PCIe 5.1 GPUs via two 6+2 pin PCIe connectors, covering most current discrete graphics cards that use this connector type.
- Universal input voltage (100–240 VAC, 50/60 Hz) means it works on both European and North American mains without a manual switch.
- Non-modular cabling — all cables are permanently attached. Ensure your case has adequate space to route and tuck unused cables before purchasing.
- Rated for operation between 0 °C and 40 °C. Systems running in environments above 40 °C ambient are outside the specified operating range.
- Does not carry a higher efficiency rating (e.g. Gold or Platinum) — not suitable for users whose priority is maximum efficiency at all load levels.
Best for
- Entry-level and mid-range desktop builders who want ATX 3.1 compliance and modern GPU support without spending on a higher-tier unit.
- Noise-sensitive environments such as home offices or living rooms, where the temperature-controlled fan and 19.5 dB(A) light-load noise level matter.
- Systems with a single mid-range GPU — the two 6+2 pin PCIe connectors and single 12V rail at 37.5 A cover most discrete graphics cards at this power tier.
- Long-term ownership — the 5-year warranty and 100,000-hour MTBF rating suit buyers who plan to keep the same system for several years.
- Energy-conscious users looking for a certified-efficient unit; 80 PLUS Bronze at up to 89.0% efficiency and a standby drain under 0.15 W reduce running costs at low and medium loads.
Trade-offs
- High-wattage builds — at 450W rated output, it is not sized for systems pairing a high-end CPU with a flagship GPU that together exceed this budget.
- Cable-management enthusiasts — the fully wired, non-modular design means all cables are always present in the case, which can complicate routing in small or tidy builds.
- Users requiring Gold or higher efficiency — the 80 PLUS Bronze rating is below Gold and Platinum tiers, so those optimising for the lowest possible energy draw should look at higher-certified alternatives.
- Dual-GPU or multi-GPU workstation setups — with only two PCIe 6+2 pin connectors and 450W output, it is not intended for configurations requiring more than two graphics card power connections.
System Power 11 450W has been built with value-oriented users in mind that do not want to pass on reliability and quietness. Elaborate features such as ATX 3.1 compatibility and a temperature-controlled fan and a remarkably low stand-by-drain underline the value System Power 11 450W offers even at entry-level.
System Power 11 450W is an ATX 3.1 PSU and handles power excursions up to double its rated power with ease. This makes the PSU versatile and the erfect choice for systems of today and the ones to come.
System Power 11 450W is equipped with a temperature-controlled 120mm quality fan. It provides the low noise operation that be quiet! is famous for, offering remarkable quietness at this price-level.
System Power 11 450W provides stable and dependable power for CPU and GPU. This ensures a steady and reliable operation even when your PC meets an unexpectedly heavy load.
The 80 PLUS® Bronze certification of System Power 11 450W Bronze with an efficiency rating of up to 89.0% is convincing evidence of this PSU's power saving operation.
System Power 11 450W provides enough power for demanding graphics cards. Safety protections defend against overcurrents, over- and undervoltages, overtemperature, short circuits and overloads, thus keeping your valuable components safe.
General
| Brand | be quiet! |
|---|---|
| Article Number | BP009EU |
| Form Factor | ATX |
| Compliance | ATX 3.1, EPS 12V v2.92 |
| Warranty | 5 years |
Power & Efficiency
| Power Output | 450W |
|---|---|
| Efficiency Certification | 80 PLUS Bronze (up to 89.0%) |
| +12V Rail | Single rail at 37.5 A |
| Power Factor | ≥ 0.98 at full load |
| Standby Power | < 0.15 W |
| Input Voltage | 100–240 VAC |
| Input Frequency | 50/60 Hz |
Cooling & Noise
| Fan Size | 120mm |
|---|---|
| Fan Bearing | Rifle-bearing |
| Fan Control | Temperature-controlled |
| Noise Level | 19.5 dB(A) at light load |
| Operating Temperature | 0–40 °C |
| MTBF | 100,000 hours at 25 °C |
Connectors & Protections
| PCIe Connectors | 2 × 6+2 pin |
|---|---|
| Cabling | Fully wired (non-modular) flat black cables |
| Protections | OCP, OVP, UVP, OPP, OTP, SCP, surge, inrush |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.