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CX Series™ CX850M — 850 Watt 80 PLUS® Bronze Certified Modular ATX PSU (2015 Edition)

Performance, reliability, and the convenience of modular cabling for basic system upgrades

CX Series Modular power supply units are an excellent choice for basic system builds and desktop PC computer upgrades, offering high reliability, low noise, and the flexibility of modular cabling.

Low noise

80 PLUS Bronze certified efficiency and clever fan design allow for little or no detectable fan noise during regular operation.

Faster installation and better-looking builds

The modular cabling system lets you use only the cables you need. You get to save space and reduce clutter for a cleaner-looking build and improved airflow.

Reliable and compatible

CX Series Modular is built and tested to strict standards for trouble-free installation and smooth operation.

Good looks

The matte black finish, black-sleeved cables, and black connectors help give your system a restrained, high-tech look.

Corsair engineering and quality control

Every Corsair power supply is designed by our California engineering team and built to our exact specifications. The same care that goes into the design and testing of our renowned high-power enthusiast power supplies also goes into the CX Series Modular, because you need confidence and reliability regardless of your build budget.

Modular cabling system

Since the peripheral power cables aren’t hard-wired to the power supply, you can connect only the cables you need for your exact configuration of PCI-E cards and storage devices. The rest of the cables stay in the box, and not in your PC’s where they can add to the clutter and interfere with airflow.

Large-diameter, thermally controlled fan

Once you’ve installed a PSU, you shouldn’t have to think about it. Employing a thermally controlled fan makes the CX Series Modular quieter at idle, and the large diameter reduces noise even when you’re pushing your system hard.

Package contents

CX Series Modular ATX Power Supply

Modular cable pack


ATX12V v2.4 and EPS12V 2.92 standards


Up to 85% energy efficiency means less heat generation and lower energy bills

0.99 Active Power Factor Correction provides clean and reliable power

Universal AC input from 90-264V

A dedicated single +12V rail offers maximum compatibility with the latest components

Over-voltage and over-power protection, under-voltage protection, and short circuit protection provide maximum safety to your critical system components

Extra long fully-sleeved cables support full tower chassis

ErP Lot 6 Compliant

A five year warranty and lifetime access to Corsair’s legendary technical support and customer service

                                                           Corsair CX850M ATX Power Supply

AC Input Rating DC Output Rating
AC Input: 100V – 240V DC Output +3.3V +5V +12V -12V +5Vsb
Current: 12A-6A Max Load 25A 25A 70.8A 0.8A 3.0A
Frequency: 47Hz – 63Hz Maximum Combined Wattage 130W 130W 850W 9.6W 15W
Total Power: 850W
Power 850 Watts
80 Plus Bronze
Fanless mode No
Wattage 850
Fan bearing technology Sleeve
Fan size (mm) 135mm
C-Link Digital No
Continuous output rated temperature (°C) 40°C
Modular Semi
MTBF 100,000 hours
Sleeved cables Low-Profile All Black
ATX Connector 1
EPS Connector 1
Floppy Connector 2
Four Pin Peripheral Connector 6
SATA Connector




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