Overview

The be quiet! Pure Power 12 M 850W (model BN505) is a mid-high tier power supply fully compliant with ATX 3.1. Rated at 850W and 80 PLUS Gold certified (up to 93.2% efficiency), it includes a native 12VHPWR cable for PCIe 5.0/5.1 GPUs, making it an excellent choice for modern high-end builds. True to be quiet!'s reputation, the unit features a 120mm silent fan, LLC resonant converter for stable voltage regulation, and dual strong 12V rails. The fully modular cable design simplifies cable management and improves airflow inside the case. With a 10-year warranty and German engineering, this PSU offers long-term reliability at a competitive price point around ¥31,000 in Japan.

Compatibility Guide

Standard ATX form factor (150×160×86mm) fits most ATX cases. Connectors: 24-pin ATX, dual 4+4-pin EPS, four 6+2-pin PCIe, one 12VHPWR (600W), nine SATA, three peripheral. The 12VHPWR cable directly powers GeForce RTX 40-series and future PCIe 5.0 GPUs without adapters. Four 6+2-pin connectors support older GPUs or multi-GPU setups. * Cable lengths are generous for full-tower cases.

Product Info

Released in late 2023, the Pure Power 12 M 850W sits in the mid-high tier. It combines ATX 3.1 readiness with 80 PLUS Gold efficiency, offering a strong price-to-performance ratio. The 10-year warranty underscores its build quality. Rated wattage: 850W Efficiency: 80 PLUS Gold (up to 93.2%) ATX version: 3.1 Fan: 120mm silent fan Modular: Fully modular 12VHPWR connector: 1 (600W capable) * Warranty: 10 years

Best Use Cases

Gamers with latest GPUs: Direct 12VHPWR connection for RTX 4070 Ti and above ensures stable power delivery. Silence-focused builders: The quiet fan and LLC circuitry keep noise low even under load. * Long-term users: 10-year warranty and German quality make it a set-and-forget component. ## Alternatives
Direct competitors include the Corsair RM850e (80 PLUS Gold, ATX 3.0) and Seasonic Focus GX-850 (80 PLUS Gold, ATX 2.52). The Pure Power 12 M stands out with native ATX 3.1 support and included 12VHPWR cable. The Corsair RM850e also supports ATX 3.0 but may require a separate 12VHPWR cable. The Seasonic Focus GX-850 lacks native 12VHPWR, needing an adapter for modern GPUs.

Things to Consider

850W may be tight for extreme builds with RTX 4090 and overclocked Core i9; consider 1000W+ for such configurations. Only one 12VHPWR connector is provided; dual-12VHPWR GPUs (some custom RTX 4090s) will need an adapter. Cables are reported to be somewhat stiff, which may complicate routing in compact cases. 80 PLUS Gold is efficient, but if you prioritize maximum efficiency, look at Platinum or Titanium models (at higher cost).