be quiet! Pure Power 12 M 1200W Power Supply Unit

The be quiet! Pure Power 12 M 1200W (MPN BN346) delivers reliable, efficient power for high-performance desktop systems. This fully modular ATX power supply combines 80 PLUS Gold certification with ATX 3.1 compliance and native PCIe 5.1 support, making it ready for the latest GPU and CPU configurations.

High Efficiency and Power Delivery

Certified 80 PLUS Gold with up to 93.7% efficiency, this PSU provides 1200W continuous power with peak output reaching 1250W. The dual 12V rail design (55A + 50A) ensures stable power distribution under heavy loads. LLC + SR + DC/DC topology maintains excellent voltage stability across all operating conditions. With a power factor exceeding 0.98 at full load and standby power under 0.12W, it meets modern energy efficiency standards.

ATX 3.1 and PCIe 5.1 Ready

Full ATX 3.1 and EPS 12V v2.92 compliance ensures compatibility with current and future hardware. The native 12VHPWR connector delivers up to 600W for PCIe 5.1 graphics cards, while four additional 6+2-pin PCIe connectors support multi-GPU configurations. Two 4+4-pin EPS connectors provide ample power for high-end processors.

Quiet Operation

The 120mm rifle-bearing fan uses temperature-controlled operation to minimize noise. Under light loads, noise levels drop to approximately 10 dB(A). The fan only spins up as needed, balancing cooling performance with acoustic comfort for quiet computing environments.

Fully Modular Cable Management

Fully modular sleeved flat cables allow you to connect only what you need, reducing clutter and improving airflow. Cable lengths reach up to 95cm for flexible routing in various case sizes. The connector array includes 1x 24-pin ATX, 2x 4+4-pin CPU, 1x 12VHPWR, 4x 6+2-pin PCIe, 6x SATA, and 2x Molex.

Comprehensive Protection

Multiple protection circuits safeguard your components: OCP (Over Current Protection), OVP (Over Voltage Protection), UVP (Under Voltage Protection), OPP (Over Power Protection), OTP (Over Temperature Protection), SCP (Short Circuit Protection), plus inrush and surge protection. Hold-up time of approximately 19ms at 100% load maintains stability during brief power fluctuations.

Built for Longevity

With an MTBF exceeding 100,000 hours at 25°C and a comprehensive 10-year manufacturer warranty, this power supply is designed for long-term reliability. Compact ATX dimensions of 150mm (W) x 160mm (D) x 86mm (H) and 1.92kg weight ensure compatibility with most standard cases.

The be quiet! Pure Power 12 M 1200W (MPN BN346) is a high-performance internal power supply unit (PSU) designed for advanced desktop PCs. It offers ATX 3.1 compatibility, 80 PLUS Gold efficiency, and PCIe 5.1 support, making it ideal for modern high-end systems. With support for modern standby, quiet operation, and full protective features, it is backed by a 10-year warranty for long-term reliability.

Key Features
Continuous power: 1200W (peak up to 1250 W)
Efficiency: 80 PLUS Gold certified, up to 93.7% efficiency
Compliance: ATX 3.1 / EPS 12V v2.92
PCIe support: Native 12VHPWR for PCIe 5.1 GPUs + 4 x 6+2-pin PCIe connectors
Rail design: Dual 12V rails for stable power under load
Cooling: 120 mm temperature-controlled fan with rifle bearing
Topology: LLC + SR + DC/DC for high performance and voltage stability
Modular cabling: Fully modular sleeved and flat cables
Warranty: 10 years manufacturer warranty

Full Technical Specification

Model / MPN:
Pure Power 12 M 1200W (BN346)

Form Factor:
ATX

Compliance:
ATX 3.1, EPS 12V v2.92

Power Output:
1200W continuous / 1250W peak

Efficiency Rating:
80 PLUS Gold (up to 93.7%)

Input Voltage:
110–240VAC

Input Frequency:
50–60Hz

Input Current:
7.5 A / 15 A

Power Factor:
> 0.98 at full load

Standby Power:
< 0.12 W

Operating Temperature:
0–40 °C

MTBF:
>100,000 hours at 25 °C

12V Rails:
2 (55 A + 50 A)

Protections:
OCP, OVP, UVP, OPP, OTP, SCP, inrush, surge

Hold-up Time:
~19 ms at 100% load

Fan:
120 mm rifle-bearing fan

Noise Levels:
As low as ~10 dB(A) under light load

Modularity:
Fully modular

Connectors:
1 x 24-pin ATX
2 x 4+4-pin CPU (EPS)
1 x 12VHPWR (600 W)
4 x 6+2-pin PCIe
6 x SATA
2 x Molex (PATA)

Cable Length:
Up to 95 cm

Dimensions:
150 mm (W) x 160 mm (D) x 86 mm (H)

Weight:
1.92 kg (PSU only)

Warranty:
10 years

• Wattage: 1200W
• Size/Version: ATX 3.1
• Modular: Fully
• SATA Connections:
• Certification:
• Colour: