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Black rectangular ATX power supply with 120mm fan and fixed cables

be quiet!

be quiet! Pure Power 12 850W ATX 3.1 PSU BP004US

SKU CH-46EK-HD9VZ MPN BP004US

850W ATX 3.1 power supply with 80 Plus Gold efficiency, a single 12V rail, one 300W PCIe 5.1 connector and two PCIe 6+2 connectors

  • Max wattage850 W
  • Power efficiency> 90%
  • Modular cablingNon-Modular
  • Fan configuration1 × 120 mm
  • 12V railsSingle
  • Efficiency certification80 PLUS GOLD Certified

Model ATX 3.1 80+ Gold (850W)

  • Delivers 850 W for demanding gaming and workstation builds
  • 80 PLUS Gold certification reaches 92.7 % efficiency for lower heat and quieter operation
  • ATX 3.1 compliant with native PCIe 5.1 12V-2x6 600 W connector for latest GPUs
  • Single 12 V rail architecture provides stable power under heavy loads
  • 120 mm be quiet! fan runs exceptionally silent during extended sessions

Pure Power 12 850W ATX 3.1 PSU

This be quiet! unit delivers 850W of continuous power for high-performance desktop builds. It targets enthusiasts assembling gaming PCs or workstations that demand stable, efficient energy delivery. The single +12V rail design simplifies cable routing and load balancing across demanding components. It suits users who prioritise quiet operation and certified efficiency in a non-modular package.

ATX 3.1 compliance and PCIe 5.1 connector

The power supply meets ATX 3.1 and ATX 3.0 specifications for modern hardware compatibility. A native 12V-2x6 connector rated for 300W supports current-generation graphics cards without adapters. Two PCIe 6+2 pin cables provide additional options for multi-GPU setups or older cards. The non-modular design means all cables are permanently attached, requiring case space for unused leads.

80 PLUS Gold efficiency up to 92.7%

Certified efficiency exceeds 90% at typical loads, reaching up to 92.7% under optimal conditions. This reduces waste heat, allowing the 120mm fan to run at lower speeds during sustained operation. LLC resonance topology and a single massive 12V rail maintain tight voltage regulation during prolonged heavy draw. Protection circuits guard against over-voltage and overload events throughout extended sessions.

How it compares

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

Price $93.99
Cheaper than about 70% 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 namebe quiet
Model namePure Power 12 850 W
Part numberBP004US
Product colorBlack
Product typeATX 12 V
Ports & slots
Connection types1 × 300 W PCIe 5.1 (12VHPWR) / 2 x PCIe 6+2 pin
Power
Max wattage850 W
Power efficiency> 90%
Modular cablingNon-Modular
12V railsSingle
Efficiency certification80 PLUS GOLD Certified
Overvoltage protectionYes
Overload protectionYes
Size & build
Shipping weight3.67 kg
Package size318 × 203 × 140 mm
More details
Fan configuration1 × 120 mm

Other versions of this model

3 more in the same range

Questions about this item

What is the 80 Plus Gold efficiency rating under sustained load?

The unit is certified 80 Plus Gold with up to 92.7% efficiency, reducing waste heat and keeping the 120 mm fan speed low during long sessions.

How loud and hot does the 120 mm fan get when the PSU runs all day?

The 120 mm be quiet! fan stays exceptionally silent because up to 92.7% efficiency means less heat to remove, so fan speed remains low even under continuous load.

Which graphics-card power cables come attached to this non-modular unit?

A native 12V-2x6 PCIe 5.1 cable rated for 600 W and three fixed PCIe 6+2 pin connectors are included for high-end GPUs.

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