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Black rectangular ATX power supply with modular cable ports and a 135 mm fan grille

NZXT

NZXT PA-8G2BB-US 850 W ATX 3.1 power supply

SKU CH-D89D-GV89H MPN PA-8G2BB-US

Fully modular 850 W ATX 3.1 unit with 80 Plus Gold efficiency, a 135 mm FDB fan and 160 mm depth for compact builds

  • Max wattage850 W
  • Modular cablingFull Modular
  • Fan configuration1 × 135 mm FDB
  • Power factor correctionActive @0.99
  • Efficiency certification80 PLUS GOLD Certified
  • Supply voltage100–240 V

Model 850W (Black)

  • ATX 3.1 standard prepares the build for modern GPU power demands
  • 850 W continuous output feeds high-end CPUs and graphics cards together
  • 80 Plus Gold certification keeps efficiency high and waste heat low
  • Fully modular cabling lets you install only the wires your system needs
  • 135 mm FDB fan runs quietly while moving ample airflow

850 W ATX 3.1 power supply

This fully modular unit delivers 850 W of continuous power for high-end desktop builds. It meets the ATX12V v3.1 and EPS12V v2.92 specifications and carries 80 PLUS Gold certification. A single 135 mm FDB fan provides cooling across the 160 mm depth chassis. The black finish suits standard ATX cases.

Replaces older ATX 2.x units

The ATX 3.1 compliance adds native 12V-2x6 support for modern graphics cards without adapters. Full modular cabling removes unused leads and improves airflow compared with semi-modular or fixed designs. The upgrade is worth it when building around current-generation GPUs that demand the new connector standard. Older systems without 12V-2x6 requirements gain no functional advantage.

Handles multi-GPU and heavy CPU loads

The +12 V rail supplies up to 850 W combined, giving headroom for overclocked CPUs and top-tier graphics cards. Minor rails provide 3.3 V at 22 A and 5 V at 22 A for legacy peripherals. Protection circuits include OVP, UVP, SCP, OTP, OPP and OCP. The unit runs out of capacity when total system draw exceeds the 850 W rating or when connector count limits additional devices.

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
Model namePA-8G2BB-US
Part numberPA-8G2BB-US
Product typeATX12 V v3.1 / EPS12 V v2.92
Product colorBlack
Ports & slots
Output type+3.3 V@22A, +5 V@22A, +5VSB@3A
Connection types24-pin ATX Power Cable: 600 mm with nylon sleeving, Output Connectors: 1
4+4-pin CPU Power Cable: 700 mm with nylon sleeving, Output Connectors: 1
8-pin CPU Power Cable: 700 mm with nylon sleeving, Output Connectors: 1
6+2-pin PCIe Power Cable: 650 mm with nylon sleeving, Output Connectors: 3
16-pin (12+4) 12 V-2 × 6 PCIe Cable: 650 mm with nylon sleeving, Output Connectors: 1
SATA Cable: 500+150 mm, Output Connectors: 12
Peripherals Cable: 500+150 mm, Output Connectors: 4
Power
Max wattage850 W
Modular cablingFull Modular
Power factor correctionActive @0.99
Efficiency certification80 PLUS GOLD Certified
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current10A-5A
Built-in protectionOVP (Over Voltage), UVP (Under Voltage), SCP (Short Circuit), OTP (Over Temp), OPP (Over Power), OCP (Over Current)
Size & build
Product dimensions150 × 86 × 160 mm
Shipping weight3.79 kg
Package size483 × 216 × 121 mm
Compatibility
PSU length limit160 mm
Environment & compliance
Regulatory approvalsFCC, Canada, CE, CB(IEC 62368-1), UKCA, CCC, BSMI, BIS, RCM, UAE, TUV, cTUVus, KC, CP65
More details
Fan configuration1 × 135 mm FDB
Mean time between failures>100,000 h

Other versions of this model

5 more in the same range

Questions about this item

Will the 160 mm depth fit in a case rated for ATX 3.1 power supplies?

The unit measures 150 mm wide, 86 mm tall and 160 mm deep, matching the ATX 3.1 form factor, so any case that accepts a standard ATX 3.1 PSU will accommodate it.

Which cables must stay attached during a full-modular build, and which can be left in the box?

Every cable is detachable; connect the 600 mm 24-pin ATX, the 700 mm 4+4-pin CPU, the 700 mm 8-pin CPU and only the PCIe or peripheral leads your components require.

When should the 135 mm FDB fan be cleaned or the unit replaced based on the 100,000-hour MTBF?

Clean the fan intake with compressed air whenever dust builds up; the MTBF rating exceeds 100,000 hours, so replacement is only needed if voltages drift out of spec or protections trigger.

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