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be quiet! · 850 W · ATX

be quiet! Straight Power 12 850W

ATX 3.1 · 80 PLUS Platinum · Modular

Capability: 78
Cap / price: 15
Wattage value: 13
Amazon: $536

Available on Amazon Updated Aug 30, 2026

Capability77.9

Capability / price14.5

Wattage value12.7

$536 on Amazon PSU table Compare this PSU

Size this PSU for a complete buildThe Builder unlocks PSU choices after it knows the CPU, GPU, case format, and estimated demand. Calculate build power first

Written analysis

be quiet! Straight Power 12 850W at a glance

The be quiet! Straight Power 12 850W is a 850 W ATX power supply built to the ATX 3.1 generation. Efficiency is listed as 80 PLUS Platinum. Cables are modular.

The calculated capability score is 77.9, averaging the available wattage, recorded efficiency percentage, and warranty inputs against fixed references. Listed warranty is 10 years. +12V output is 70 A.

Best fit: Performance desktops whose calculated component load fits comfortably within a 750–999 W supply.

Platform and cooling

Dimensions are listed as 160 x 150 x 86 mm. Cooling fan size is 135 mm. The unit uses 1 +12V rail at up to 70.80 A per rail. Certifications include 80 PLUS® Platinum.

Current value

At $536, price per kilowatt is $630.73. Capability / price is 14.5 and wattage value is 12.7. Compare nearby supplies below; wattage alone does not determine value.

Unit data

Full specifications

Wattage, efficiency, platform size, electrical outputs, connectors, cooling, and value in one technical sheet.

General

Manufacturer: be quiet!
PSU: be quiet! Straight Power 12 850W
Launch price: —
Amazon price: $536
Amazon availability: Available
Price updated: Aug 30, 2026

Power & efficiency

Wattage: 850 W
Efficiency: 80 PLUS Platinum
Recorded efficiency: 93%
Warranty: 10 years

Value

Amazon price: $536
Price / kW: $630.73
Capability: 77.9
Capability / price: 14.5
Wattage value: 12.7

Platform & size

ATX generation: 3.1
Form factor: ATX
Dimensions: 160 x 150 x 86 mm
Modular: Yes
Fanless: No

Electrical

Input voltage: 100-240
+12V output: 70 A
+5V output: 25 A
+3.3V output: 25 A
+12V rails: 1
Max amps / rail: 70.80 A

Cooling & build

Fan size: 135 mm
Fan stop: No
Certifications: 80 PLUS® Platinum

Additional information

Also listed as: Straight Power 12 Power Supply Unit 850 W

Amazon

Price history

Nearby capability

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be quiet! be quiet! Pure Power 12 M 850W 850 W · ATX · Modular

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be quiet! be quiet! Pure Power 12 M 850W 850 W · ATX · Modular

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be quiet! be quiet! Straight Power 12 850W This PSU

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$536

Lian Li Lian Li Edge Series-850W 850 W · ATX · Modular

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be quiet! be quiet! Power Zone 2 850W 850 W · ATX · Modular

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be quiet! be quiet! Pure Power 13 M 850W 850 W · ATX · Modular

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be quiet! Straight Power 12 850W at a glance

Platform and cooling

Current value

General

Power & efficiency

Value

Platform & size

Electrical

Cooling & build

Additional information

Price history

Similar PSUs

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