be quiet!

be quiet! Pure Power 12 M 850W

Expert rating8.2 / 10

Wattage:: 850 W
80 PLUS Rating:: Gold
Modularity:: Fully Modular
ATX Standard:: ATX 3.0

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Manufacturer: be quiet! Last updated: 2026-09-12

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be quiet! Pure Power 12 M 850W Review

If you're searching for the be quiet! Pure Power 12 M 850W, or just looking for a solid 850W 80 PLUS Gold PSU in a ATX form factor, here's the full rundown on specs, price, and how it stacks up.

Short answer: the Pure Power 12 M 850W is a fully modular 850W unit built to the ATX 3.0 spec, and we'd recommend it if you want Gold-tier efficiency at this wattage without chasing a flagship price tag.

Efficiency and Build Quality

The Pure Power 12 M 850W carries an 80 PLUS Gold certification and Cybenetics Gold efficiency / A- noise, built on a HEC platform. Its 120mm rifle bearing fan keeps noise down, with Zero-RPM fan-stop under light loads.

Connectors and Cabling

You get 1x 24-pin ATX, 1x EPS 4+4, 1x 12V-2x6 (450W), 4x PCIe 6+2-pin, 6x SATA, 3x Molex. Cable lengths run 24-pin 600mm, EPS 650mm, 12V-2x6 600mm, PCIe 600mm, SATA 700mm, and the cables are standard black ribbon/flat, not sleeved. It's rated for a 17ms hold-up time and backed by OCP, OVP, OPP, SCP, OTP, UVP protection circuitry.

Comparison to Alternatives

Compared to the be quiet! Pure Power 12 M 750W, the Pure Power 12 M 850W lands in the same efficiency tier at a different capacity, so the choice mostly comes down to how much wattage headroom you actually need. It's also worth cross-shopping against the Cooler Master MWE Gold 750 V2 if you're weighing Gold-tier options in this wattage class; both land in a similar price bracket, so the deciding factor usually comes down to form factor, cable sleeving, and warranty length.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Expert rating8.2 / 10

The 850W Pure Power 12 M tops out the modular M-series, giving budget-focused builders a native 12V-2x6 connector and Gold efficiency without stepping up to the pricier Straight Power line.

Best for

High-end single-GPU gaming builds (RTX 4080/4090-class cards)
Builders who want Gold-tier efficiency with future GPU upgrade headroom
Systems that benefit from a native 12V-2x6 cable

Not for

Budget builds where a 550-650W unit would be sufficient
Extreme dual-GPU or workstation rigs needing 1200W+
Buyers who specifically need SFX/SFX-L sizing

Specifications

What these specs mean

Identity

Brand	be quiet!
Model Number	Pure Power 12 M 850W

Output and rails

Single +12V Rail	No

Standards and compliance

PCIe CEM Standard	PCIe 5.0
Hold-Up Time	20.6 ms

Efficiency and noise

Measured Avg Efficiency	89.81 %
Measured Average Noise	25.03 dBA

GPU power delivery

Max Watts Per GPU Conn	600 W

Connector inventory

EPS 8-pin Connectors	2
SATA Connectors	6
Molex Connectors	2

Form factor and fit

Length	160 mm
Colour	Black

Cooling

Fan Bearing	Rifle

Build quality

MTBF	100000 hours

Cables

Modularity	Fully Modular

Monitoring, protection and price

Protections	OTP, OCP, OPP, SCP, OVP, UVP, SIP
Price	129.99 USD
Warranty	10 years

Wattage	850 W
80 PLUS Rating	Gold
ATX Standard	ATX 3.0
Form Factor	ATX
Cybenetics Efficiency	Platinum
Cybenetics Noise	A-
12V-2x6 Connectors	1
Zero-RPM Mode	No
Sleeved Cables	Yes
PCIe 8-pin Connectors	4
Connector Count	1x 24-pin ATX, 1x EPS 4+4, 1x EPS 8-pin, 1x 12VHPWR (600W), 4x PCIe 6+2-pin, 6x SATA, 2x Molex
Fan Size	120 mm
Fan Model / Bearing	120mm rifle bearing (BQ QF2-12025-HS)
OEM / Platform	HEC
Cable Lengths	24-pin 550mm, EPS 600mm, 12VHPWR 600mm, PCIe 500+150mm, SATA 500+150+150+150mm

FAQs

What are the key specifications of the be quiet! Pure Power 12 M 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.0)?

Key specs for the be quiet! Pure Power 12 M 850W: Wattage 850 W, Modularity Fully Modular, Fan Size 120 mm, Warranty 10 years, 80 PLUS Rating Gold, Cybenetics Efficiency Platinum.

Will the be quiet! Pure Power 12 M 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.0) work with my current setup?

The be quiet! Pure Power 12 M 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.0) lists Wattage is 850 W. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.

Who is the be quiet! Pure Power 12 M 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.0) best suited to?

Best suited to: High-end single-GPU gaming builds (RTX 4080/4090-class cards); Builders who want Gold-tier efficiency with future GPU upgrade headroom; Systems that benefit from a native 12V-2x6 cable.

What are the drawbacks of the be quiet! Pure Power 12 M 850W (850W/80+ Gold/ATX/Fully Modular/ATX 3.0)?

Not the best fit for: Budget builds where a 550-650W unit would be sufficient; Extreme dual-GPU or workstation rigs needing 1200W+; Buyers who specifically need SFX/SFX-L sizing.