We build systems to your specification

Total Price:

Exc. VAT : £ 92.55
Inc. VAT : £ 111.06

Be Quiet! 850W Pure Power 11 FM PSU, Fully Modular, Rifle Bearing Fan, 80+ Gold, Cont. Power

Exc. VAT : £ 92.55
Inc. VAT : £ 111.06
5 items left

Exceptional Quiet, Superior Features

Pure Power 11 FM 850W offers peerless dependability and best-in-class features such as modular cables. Whether you are assembling a very quiet system, upgrading your PC, or building a gaming system with an overclocked high-end GPU_ Pure Power 11 FM 850W offers the best combination of features at a very popular price.
  • 80 PLUS® Gold efficiency (up to 93.3%) 
  • Modular cables for maximum build flexibility
  • Two strong 12V-rails
  • Silence-optimized 120mm be quiet! fan
  • Advanced stability and voltage regulation thanks to LLC, SR and DC-to-DC 
  • Four PCIe connectors for overclocked high-end GPUs
  • Full suite of top safety features
  • Five-year manufacturer’s warranty

80 PLUS Gold Certification
Very high operating efficiency

Pure Power 11 FM 850W is certified 80 PLUS Gold with an efficiency rating of up to 93.3%  – a truly outstanding level for this class of PSU. The most compelling benefit is lower power consumption, lower costs, and cooler, quieter operation. Whether you are building a very quiet system or gaming system_ Pure Power 11 FM 850W is always the correct choice!

Modular Cables
Utmost convenience and compatibility
Thanks to the modular cables, all cables that serve no purpose are left out. For this reason, systems always appear very tidy. At the same time installation is performed much more conveniently. A smoother airflow results from the uncluttered layout of the system, which means lower noise and temperatures prevail inside the case.

Power and Compatibility
For your system

Pure Power 11 FM offers 850W of continuous power with two independent 12V rails for signal stability and four PCI express connectors. It is suited to very quiet systems, upgrading or building multimedia, gaming or systems with an overclocked high-end GPU.

Exceptionally Silent Operation
Achieved by a silence-optimized 120mm be quiet! fan

The silence-optimized 120mm be quiet! fan is thermally governed to strike the best balance between effective cooling and quietness. Airflow-optimized fan blades reduce turbulence, enabling best-in-class quiet functionality and the almost inaudible operation that be quiet! is famous for.

High-Class Technologies

Compatibility for the systems of tomorrow
LLC and Synchronous Rectifier (SR) provide very stable operation and enhanced voltage regulation. The PSU is equipped with DC-to-DC conversion for tight voltage regulation even under heavy cross-loading conditions. This ensures reliable operation with the current generation of processors and graphics cards.



At 230V, 20% load_ 91.8% At 230V, 50% load_ 93.3% At 230V, 100% load_ 91.2%
100,000 hours
Over current protection Over Voltage protection Under Voltage protection Short circuit protection Over temperature protection Over power protection Surge & Inrush Protection
See Overview / Video
Package Contents
Power Supply Screws Cable ties Manual
1.85 kg (L x W x D) 160 x 150 x 86 mm
80+ Gold
Package Weight
1.6900 kg
5 Years

80+ Certification
Form Factor
1 x ATX-Motherboard (20+4-pin) 1 x P8 (CPU) 1 x P4+4 (CPU) 4 x PCI-e 6+2-pin (GPU) 2 x PATA 10 x SATA 1 x FDD (Floppy)
Be Quiet! Pure Power 11 FM
Fully Modular
#Hide#Wattage Range
800 - 860W
850 W
Rail Design
dB(A) at 20% load_ 9.6 dB(A) at 50% load_ 9.7 dB(A) at 100% load_ 25.9
Dual 12V
AC Input
AC 100-240 V
Active PFC
Fan Type
Silence-optimized 120mm be quiet! fan
Fan Bearing
Rifle Bearing