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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

  • Max wattage850 W
  • Modular cablingFull Modular
  • Fan configuration135 mm FDB Cooling Fan
  • Main power connector20+4Pin
  • 12V railsSingle
  • PCIe power connectors6 × 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.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $201.99
Pricier than about 63% of the 10,869 comparable items (median $142.99).
Max wattage 850 W
Typical for this category: the median of 930 items is 850 W.

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Specifications

Product
Brand nameCORSAIR
Product lineAX Series AX850
Model nameCP-9020151-NA
Product typeATX12 V
Ports & slots
PCIe power connectors6 × 6+2-Pin
SATA power connectors16
Output type+3.3 V@20A, +5 V@20A, +12 V@70A, +5VSB@3A
Power
Max wattage850 W
Modular cablingFull Modular
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS TITANIUM Certified
Overvoltage protectionYes
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current11A - 5.5A
Size & build
Product dimensions3.39 in × 5.91 in × 6.69 in
Product weight4.43 lb (2.01 kg)
Shipping weight4.03 kg
Package size351 × 213 × 145 mm
Compatibility
PSU length limit170 mm
More details
Fan configuration135 mm FDB Cooling Fan

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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