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Rectangular black ATX power supply with modular cable sockets and a 135mm fan grille

Corsair

Corsair AX850 CP-9020151-NA 850 W power supply

SKU CH-6AA6-F6S95 MPN CP-9020151-NA

Fully modular ATX12V unit delivers 850 W with 80 PLUS Titanium efficiency and a 135 mm FDB fan that stops at low load

  • TypeATX12V
  • Maximum Power850 W
  • Fans135mm FDB Cooling Fan
  • Main Connector20+4Pin
  • +12V RailsSingle
  • PCI-Express Connector6 x 6+2-Pin
  • Delivers up to 850 W continuous output for demanding builds
  • 80 PLUS Titanium certification guarantees over 94 % efficiency at typical loads
  • Fully modular cabling lets you connect only the cables your system needs
  • Zero RPM fan mode stops the 135 mm FDB fan completely at low and medium loads
  • Single +12 V rail rated at 70 A provides stable power to high-end graphics cards

AX850 850 W ATX power supply

The Corsair AX850 is a fully modular ATX12V unit rated at 850 W. It targets builders who need reliable delivery for high-end desktop systems. A single +12 V rail supplies up to 70 A for consistent GPU and CPU power. The 170 mm length fits most standard chassis.

80 PLUS Titanium efficiency under load

At typical loads the unit exceeds 94 percent efficiency, reducing waste heat and keeping internal temperatures lower. The 135 mm FDB fan remains off during low and medium demand thanks to Zero RPM mode. Under sustained heavy load the fan spins up to maintain stable output without thermal throttling.

Single +12 V rail with 70 A capacity

The single-rail design delivers the full 850 W through one +12 V line rated at 70 A. This topology simplifies cable routing and removes the need to balance multiple rails. It is the specification that determines whether the PSU can support your graphics card and CPU combination.

Highlights

  • Delivers up to 850 W continuous output for demanding builds
  • 80 PLUS Titanium certification guarantees over 94 % efficiency at typical loads
  • Fully modular cabling lets you connect only the cables your system needs
  • Zero RPM fan mode stops the 135 mm FDB fan completely at low and medium loads
  • Single +12 V rail rated at 70 A provides stable power to high-end graphics cards

Specifications

BrandCORSAIR
SeriesAX Series AX850
ModelCP-9020151-NA
TypeATX12V
Maximum Power850 W
Fans135mm FDB Cooling Fan
Main Connector20+4Pin
+12V RailsSingle
PCI-Express Connector6 x 6+2-Pin
SATA Power Connector16
Max PSU Length170 mm
ModularFull Modular
Energy-Efficient80 PLUS TITANIUM Certified
Over Voltage ProtectionYes
Input Voltage100 - 240 V
Input Frequency Range50/60 Hz
Input Current11A - 5.5A
Output+3.3V@20A, +5V@20A, +12V@70A, [email protected] , +5VSB@3A
Connectors1 x ATX (24-PIN) (20+4)
2 x EPS/ATX12V (8-PIN) (4+4)
6 x PCI-E (8-PIN) (6+2)
8 x SATA (4 SATA)(right angle)
8 x SATA (4 SATA)(straight)
6 x Peripheral (4-PIN)
1 x Floppy Adapter (4-PIN)
Features80 PLUS Titanium Certified: More than 94% efficient operation for lower power consumption, less noise and cooler temperatures.
Zero RPM Fan Mode: At low and medium loads, the cooling fan switches off entirely for near-silent operation.
World Class Electrical Performance: Superior voltage regulation and minimal ripple noise ensures the highest quality power for your PC.
135mm Cooling Fan: Low noise cooling with powerful airflow, powered by a true FDB bearing for reduced noise and longer life.
100% All Japanese 105°C capacitors: Premium internal components ensure unwavering power deliv
Dimensions3.39" x 5.91" x 6.69"
Weight4.43 lbs.
Shipping weight4.03 kg
Package size351 × 213 × 145 mm

Questions about this item

How loud is the 135 mm FDB fan when the AX850 runs at low and medium loads all day?

The Zero RPM Fan Mode stops the 135 mm FDB fan completely at low and medium loads, giving near-silent operation while the unit delivers up to 850 W.

What cables must I already have to connect the AX850 to my motherboard and drives?

All cables are detachable; the box includes a 24-pin ATX, two 4+4-pin EPS, six 6+2-pin PCIe, sixteen SATA, six 4-pin peripheral and one floppy adapter.

Will the AX850 fit and power a system that still uses older 4-pin peripheral and floppy devices?

Yes, the 170 mm long unit supplies six 4-pin peripheral connectors and one floppy adapter alongside modern 24-pin ATX and EPS cables.

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