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Black rectangular ATX power supply with modular cable ports and a 120mm fan grille

NZXT

NZXT NP-C850M-US C850 850 W power supply

SKU CH-74AR-X1J80 MPN NP-C850M-US

An 850 W ATX unit with full modular cabling, a 120 mm fluid-dynamic-bearing fan, 80 PLUS Gold efficiency and six PCIe plus eight SATA connectors

  • Max wattage850 W
  • Power efficiency20% loading: 87%, 50% loading: 90%, 100% loading: 87% @115Va
  • Modular cablingFull Modular
  • Fan configuration1 × 120 mm Fluid Dynamic Bearing Fan
  • Power factor correctionActive
  • Main power connector24Pin

Model ATX 80+ Gold (850W)

  • 850 W output powers demanding multi-GPU builds
  • 80 PLUS Gold efficiency reaches 90 percent at 50 percent load
  • Full modular cabling keeps the interior tidy
  • Single +12 V rail delivers 70 A for stable GPU power
  • 120 mm fluid dynamic bearing fan runs quietly under load

C850 850 W ATX power supply

The NZXT C850 is an 850 W ATX12V v2.4 unit built for desktop systems that need reliable, high-output power. Its fully modular cable set lets builders connect only what the build requires. A single 120 mm fluid-dynamic-bearing fan handles cooling. Over-voltage protection guards connected components.

ATX12V v2.4 interface limits

The ATX12V v2.4 and EPS12V v2.92 specifications define the connector layout and voltage regulation this unit follows. Input accepts 100-240 V at 50/60 Hz, drawing 12-6 A depending on mains voltage. The single +12 V rail delivers up to 70 A, while +3.3 V and +5 V rails each provide 20 A. Efficiency reaches 87 % at 20 % load, 90 % at 50 % load and 87 % at full load measured at 115 Vac.

850 W capacity and headroom

Six 6+2-pin PCIe connectors and two 4+4-pin CPU cables support multi-GPU configurations and high-end processors. Eight SATA power plugs and six peripheral connectors cover storage and accessories. The gold-certified platform maintains its rated output up to the 850 W ceiling; sustained loads beyond that rating exceed the design envelope. MTBF exceeds 100,000 hours under normal operating conditions.

How it compares

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

Price $109.99
Cheaper 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 nameNZXT
Product lineC850
Model nameNP-C850M-US
Part numberNP-C850M-US
Product typeATX12 V v2.4 / EPS12 V v2.92
Ports & slots
PCIe power connectors6 × 6+2-Pin
SATA power connectors8
Output type+3.3 V@20A, +5 V@20A, +12 V@70A, +5VSB@3A
Connection types1 × 24-pin ATX power
2 × 4+4-pin CPU power
6 x PCIe (6+2 pin)
8 x SATA
6 x Peripherals
Power
Max wattage850 W
Power efficiency20% loading: 87%, 50% loading: 90%, 100% loading: 87% @115Vac
Modular cablingFull Modular
Power factor correctionActive
Main power connector24Pin
12V railsSingle
Efficiency certification80 PLUS GOLD Certified
Overvoltage protectionYes
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current12–6A
Size & build
Product dimensions3.39 in × 5.91 in × 5.91 in
Shipping weight2.99 kg
Package size330 × 229 × 127 mm
Compatibility
PSU length limit150 mm
In the box
Included itemsIncluded Cables
1 × 24-pin ATX power (length:610 mm, Nylon sleeving)
2 × 4+4-pin CPU power (length:650 mm, Nylon sleeving)
3 x PCIe (6+2 pin) (length:675 +75 mm, Nylon sleeving)
2 x SATA (length: 500 + 100 + 100 + 100 mm)
2 x Peripherals (length: 500 + 100 + 100 mm)
Environment & compliance
Regulatory approvalsCB / CE / FCC / TUV / cTUV-SUDus / China CCC / Taiwan BSMI / Australia RCM / EAC
More details
Fan configuration1 × 120 mm Fluid Dynamic Bearing Fan
Mean time between failures>100,000 h

Other versions of this model

1 more in the same range

Questions about this item

Should I pick the C850 850 W unit or a lower-wattage model such as the C750 750 W or C650 650 W?

Choose the 850 W model if your build needs up to 70 A on the +12 V rail for multi-GPU configurations; the 750 W and 650 W units are specified for GPUs up to 2080 Ti or Vega 64.

What does the 80 PLUS GOLD rating tell me about efficiency at typical loads?

At 115 V input the unit delivers 87 % efficiency at 20 % load, 90 % at 50 % load and 87 % again at full 850 W load.

How does the ATX12V v2.4 and EPS12V v2.92 standard affect the connectors I can use?

The design provides one 24-pin ATX connector, two 4+4-pin CPU connectors, six 6+2-pin PCIe connectors, eight SATA connectors and six peripheral connectors.

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