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

Corsair

Corsair HX850 CP-9020138-NA 850 W power supply

SKU CH-BCRD-06HZG MPN CP-9020138-NA

A fully modular 850 W ATX power supply with 80 PLUS Platinum efficiency, a 135 mm fluid-dynamic-bearing fan, six PCIe 6+2-pin connectors and 16 SATA power connectors

  • Max wattage850 W
  • Modular cablingFull Modular
  • Fan configuration1 × 135 mm Fluid Dynamic Bearing Fan
  • Main power connector24Pin
  • 12V railsSingle +12 V Rail or Multi +12 V Rail Mode
  • PCIe power connectors6 × 6+2-Pin

Model ATX 80+ Platinum (850W) HX Series 135mm Fan

Show 3 more
  • 850 W output powers demanding components with headroom
  • 80 PLUS Platinum efficiency reduces waste heat and running cost
  • Fully modular cabling keeps the build tidy and airflow clear
  • 135 mm fluid-dynamic-bearing fan with Zero RPM mode stays silent at low loads
  • Switchable single or multiple +12 V rail modes suit different protection needs

HX Series 850 W Fully Modular ATX Supply

The Corsair HX850 is an 850 W ATX12V v2.4 power supply with 80 PLUS Platinum efficiency and full modular cabling. A 135 mm fluid dynamic bearing fan provides cooling, while a +12 V rail switch lets builders choose between single and multi rail operation. The unit measures 180 mm in length and fits standard ATX cases.

Best for High End Builds Needing Platinum Efficiency

Enthusiasts who want low heat, quiet operation at light loads and cable flexibility will suit this model. Systems that only require a basic bronze or gold unit, or builds constrained to shorter PSU bays, should consider other options.

Single or Multi +12 V Rail Switch Decides Fit

The onboard switch selects one 70.8 A rail or seven 40 A rails, directly affecting over current protection behaviour for high power GPUs. Choose the mode that matches your graphics card and motherboard requirements.

How it compares

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

Price $165.99
Pricier than about 55% 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 lineHX Series HX850
Model nameCP-9020138-NA
Product typeATX12 V v2.4 / EPS12 V 2.92
Ports & slots
PCIe power connectors6 × 6+2-Pin
SATA power connectors16
Output typeSingle +12 V Rail Mode:
+3.3 V @ 25A, +5 V @ 25A, +12 V @ 70.8A, -12 V @ 0.8A, +5VSB @ 3A
Multiple +12 V Rail Mode:
+3.3 V @ 25A, +5 V @ 25A, +12V1 @ 40A, +12V2 @ 40A, +12V3 @ 40A, +12V4 @ 40A, +12V5 @ 40A, +12V6 @ 40A, +12V7 @ 40A, -12 V @ 0.8A, +5VSB @ 3A
Power
Max wattage850 W
Modular cablingFull Modular
Main power connector24Pin
12V railsSingle +12 V Rail or Multi +12 V Rail Mode
Efficiency certification80 PLUS PLATINUM Certified
Overvoltage protectionYes
Supply voltage100–240 V
AC input frequency47–63 Hz
Rated input current12–6 A
Size & build
Product dimensions3.39 in × 5.91 in × 7.09 in
Product weight4.3 lb (1.95 kg)
Shipping weight3.98 kg
Package size396 × 226 × 152 mm
Compatibility
Haswell compatibilityYes
PSU length limit180 mm
In the box
Included itemsHX Series ATX Power Supply
Power cord
Mounting screws
Cable ties
Corsair case badge
User manual
Environment & compliance
Regulatory approvalsFCC, ICES, CE, UL, cUL, RCM, TÜV, CB, CCC, BSMI, EAC, RoHS, WEEE, KC
More details
Fan configuration1 × 135 mm Fluid Dynamic Bearing Fan
Mean time between failures100,000 h

Other versions of this model

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Questions about this item

How do I confirm the fan is operating in zero-RPM mode at low load?

The 135 mm fluid-dynamic-bearing fan stops spinning entirely below the zero-RPM threshold; you will hear no fan noise while the system draws light power.

Which cables come pre-attached and which must be connected from the modular set?

No cables are permanently attached; the box includes the full modular cable kit with a 24-pin ATX, six 6+2-pin PCIe and sixteen SATA connectors.

Should I run the +12 V rail switch in single-rail or multi-rail mode for a build with three graphics cards?

Single-rail mode delivers the full 70.8 A on one +12 V rail, which is simpler for multi-GPU setups; multi-rail splits current across up to seven 40 A rails for added per-rail protection.

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