This article covers be quiet! PC電源ユニット Pure Power 12 M 850W PCIe5.1対応 80PLUS Gold ATX 3.1 国内正規代理店品 BN756 PUR-PWR-12.

Overview

The be quiet! Pure Power 12 M 850W is a fully modular 80PLUS Gold power supply that fully complies with the ATX 3.1 standard. Rated at 850W, it includes a native 12VHPWR connector for PCIe 5.0 GPUs, making it a future-proof choice for the latest GeForce RTX 40 and upcoming 50 series cards. Its dual +12V rail design ensures stable current delivery and improves safety by limiting per-rail current. Positioned as a mid-high-end PSU, it strikes an excellent balance between efficiency, quiet operation, and modern connectivity. The 80PLUS Gold certification keeps heat and power waste low, which benefits overall system airflow and electricity bills.

Compatibility Guide

The unit uses the standard ATX (PS/2) form factor, fitting most mid-tower and full-tower cases. It provides a 20+4 pin ATX, two 4+4 pin CPU, several 6+2 pin PCIe, and a native 12VHPWR (12+4 pin) connector. No adapter is necessary for modern high-end GPUs. For system matching, 850W is ideal for a Core i7/Ryzen 7 with a RTX 4070 Ti Super or RX 7800 XT. If you plan on a flagship CPU (Core i9/Ryzen 9) paired with an RTX 4080 Super or above, stepping up to 1000W or more is recommended.

Product Info

The Pure Power 12 M 850W launched around 2023 and is widely available through Japanese distributors (model BN756 PUR-PWR-12/M/850W) on and other retailers. Pricing falls around ¥20,000–¥22,000, offering strong value given its 80PLUS Gold efficiency, full modularity, and ATX 3.1 support. The unit comes with a 5-year warranty. Market-wise, it sits above entry-level bronze units and below premium platinum models. It targets users who want the latest standards without overspending on features they don't need.

Best Use Cases

Gaming Builds: With a native 12VHPWR connector, cabling is clean and safe for RTX 4070 Ti and above. The 80PLUS Gold efficiency reduces heat output, helping maintain lower case temperatures during long gaming sessions. Quiet PC Enthusiasts: The 120mm fan only spins up under meaningful load; at idle or low usage, the PSU is virtually silent. Ideal for recording studios, media centers, or nighttime work. * Always-On Systems: High efficiency cuts electricity costs, and the 5-year warranty provides peace of mind for 24/7 operation in NAS or home server builds. ## Alternatives
Key competitors at the same price point include the Corsair RM850e (80PLUS Gold, fully modular, ATX 3.0) and the Seasonic Focus GX-850 (80PLUS Gold, fully modular, ATX 2.52). The RM850e is slightly cheaper but uses ATX 3.0 instead of 3.1 (minor improvement in transient handling). The Focus GX-850 is renowned for build quality but lacks a native 12VHPWR cable — you'll need an adapter. The Pure Power 12 M's dual rail design and native 12VHPWR make it a better match for the newest GPUs, especially if you value safety and tidy wiring.

Things to Consider

First, pay attention to the 12VHPWR cable bend radius — while be quiet! cables are fairly flexible, forcing a tight bend against the side panel can damage the connector. Leave some slack. Second, 850W is not enough for absolute top-tier configurations. An RTX 4090 + Core i9-14900K under full load can trigger transient spikes that exceed the PSU's capacity. For such builds, consider 1000W or higher. Third, the dual +12V rail design (two rails of ~40A each) may trip overcurrent protection on some high-power GPUs or aggressive overclocking. This is rare but worth noting if you plan extreme tuning. Finally, check your case's PSU compartment depth. The unit is 160mm deep, which is standard, but some compact cases may require more space for modular connectors.

Product Disclosure (Amazon)

  • Manufacturer: be quiet!
  • ASIN: B0BT2Y1LKQ
  • Note: This article covers a manufacturer-made product based on Amazon listing details.