be quiet! Pure Power 13 M 850W Power Supply, 80 Plus® Gold Certification, ATX 3.1 PSU, Support for PCIe 5.1 GPUs, semi-Passive 120mm be quiet! Fan, LLC Technology, Single Rail, for Overclocked GPUs
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AI Verdict
This 850W ATX 3.1 power supply with 94.4% 80 Plus Gold efficiency and a semi-passive 120mm fan is for PC builders prioritizing quiet operation and future-proof GPU compatibility.
This 850W ATX 3.1 power supply is a strong fit for modern gaming and workstation PCs, especially those with PCIe 5.1 GPUs, due to its native 12V-2x6 connector and ability to handle power excursions up to double its rated wattage. Its semi-passive cooling and 10 dB average noise output make it ideal for quiet systems.
If you need even higher efficiency or more robust internal components for extreme overclocking, look for a power supply with an 80 Plus Platinum or Titanium certification and all 105°C rated Japanese capacitors.
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Pros
- Achieves up to 94.4% efficiency with its 80 Plus Gold certification, reducing power consumption and heat output.
- Includes a native 12V-2x6 connector for next-generation PCIe 5.1 GPUs and 4 PCIe 6+2-pin connectors for current-gen cards.
- Features a semi-passive 120mm fan that completely stops under low load, contributing to an average noise output of 10 dB.
- Handles power excursions up to double its rated 850W, ensuring stable operation with demanding components.
- Offers fully modular cabling, simplifying cable management and improving internal airflow within a PC case.
- Maintains stable voltage regulation and efficiency through LLC technology.
Cons
- Some users reported receiving units with 85° rated capacitors, while others received 105° rated ones, indicating an inconsistency in component quality.
- Lacks fan failure protection, which could be a concern for long-term reliability if the fan malfunctions.
- The 10-year warranty is standard, but some competitors offer longer terms for high-end PSUs.
Dimension Scores
The PSU is 80 Plus Gold certified with up to 94.4% efficiency and handles power excursions up to double its rated 850W.
Its semi-passive 120mm fan operates silently under low loads, with reported average noise output of 10 dB, making it one of the quietest options.
It uses LLC technology for stable voltage regulation and offers a 10-year warranty, though some users reported inconsistent capacitor ratings (85°C vs 105°C).
The fully modular design allows for removal of unnecessary cables, significantly improving internal airflow and tidiness.
Best For
- Gaming PCs with high-end, overclocked GPUs requiring a 12V-2x6 PCIe 5.1 connector.
- Quiet PC builds where minimal fan noise is a priority, especially under low system loads.
- Systems needing stable power delivery for massive transient loads from modern CPUs and GPUs.
- Users who value a tidy internal PC aesthetic due to fully modular cabling.
Not Recommended For
- Budget-constrained builds, as its features and efficiency come at an entry-plus price point.
- Users who frequently push their systems to maximum load for extended periods and prioritize absolute maximum component longevity over noise, given the capacitor lottery concern.
- Small form factor (SFF) builds, as it uses a standard ATX form factor.
Watch Out For
- Some buyers reported a 'capacitor lottery,' where units shipped with either 85°C or 105°C rated capacitors, potentially affecting long-term durability for some users.
- The product does not include fan failure protection, meaning a fan malfunction could go unnoticed until system issues arise.
- Despite being 80 Plus Gold certified, one user noted the 13M 850W was tested at Platinum A++ efficiency but not marketed as such, which might lead to underestimation of its actual efficiency.
Full Specifications
| ASIN | B0FBY3F1NT |
| Brand | be quiet! |
| Wattage | 850 watts |
| Model Name | BP027US |
| Form Factor | ATX |
| Item Weight | 6.89 pounds |
| Manufacturer | be quiet! |
| Connector Type | ATX |
| Cooling Method | Air |
| Output Wattage | 850 Watts |
| Item model number | BP027US |
| Compatible Devices | PC |
| Product Dimensions | 6.3 x 5.91 x 3.39 inches |
| Power Supply Design | Full Modular |
| Item dimensions L x W x H | 6.3 x 5.91 x 3.39 inches |
What Buyers Say
Users consistently highlight the exceptionally quiet operation of the Pure Power 13 M 850W, often noting its semi-passive fan and low dB output as a major selling point. The inclusion of the native 12V-2x6 connector for new GPUs is a frequently praised feature, making it a forward-looking choice. However, some buyers expressed concern over the reported 'capacitor lottery,' where the quality of internal components seemed to vary between units. Despite this, the PSU's ability to handle power spikes and its overall stability under stress tests are also noted positively.
“Man, this thing is SO quiet, I literally can't hear it over my case fans, even when I'm gaming hard. But I saw some talk about the capacitors, hope I got a good batch for my RTX 4080!”
Common Praise
- Fan remains off during light loads, making the PC practically silent.
- Native 12V-2x6 600W cable supports new PCIe 5.1 GPUs without adapters.
- Maintains consistent and cool performance even during 48-hour stress tests with 100 power cycles.
- Fully modular cables make system building and cable routing much cleaner.
- High efficiency (up to 94.4%) reduces electricity costs and heat generation.
- Handles power excursions up to double its rated wattage without issues.
Common Complaints
- Inconsistency in capacitor ratings (some 85°C, some 105°C) reported by users, raising questions about long-term reliability for some units.
- Lacks a fan failure protection mechanism, which could be a missed safety feature.
- One isolated report of a burnt 12V-2x6 connector with a high-end GPU, though this appears to be an anomaly.
Ownership Tips
- The semi-passive fan means the PSU contributes zero noise during web browsing or light tasks, only spinning up under heavier loads.
- The fully modular cables really do make a difference for a clean build, especially in cases with limited space.
- The 12V-2x6 connector is a huge convenience for newer GPUs, avoiding the need for multiple adapter cables.
- Even under sustained loads, the power delivery remains stable, with no noticeable voltage drops or system instability.
Frequently Asked Questions
Does this PSU support the new NVIDIA RTX 40-series GPUs?
Yes, the Pure Power 13 M 850W is an ATX 3.1 PSU and includes a native 12V-2x6 connector for next-generation PCIe 5.1 graphics cards, like the RTX 40-series.
Is this power supply quiet during normal use?
Yes, it features a semi-passive 120mm fan that turns off completely under low load, making it exceptionally silent. User reports indicate an average noise output of 10 dB.
Are the cables modular?
Yes, the Pure Power 13 M 850W has fully modular cables, which helps with cable management and airflow inside your PC case.
What is the warranty period for this power supply?
The power supply comes with a 10-year limited warranty for both labor and parts.
Can this PSU handle power spikes from high-end GPUs?
Yes, it's designed to handle power excursions up to double its rated 850W, ensuring reliable operation even when graphics cards demand excessive power for short periods.
Buying Guide
When you're picking a power supply, you're basically choosing the heart of your PC. It converts wall power into usable electricity for all your components. You need enough wattage for your CPU and GPU, but also stable power delivery so your expensive parts don't get fried. Don't cheap out here; a bad PSU can take out your whole system.
Wattage (850W)
80 Plus Gold Certification (up to 94.4% efficiency)
ATX 3.1 & PCIe 5.1 (12V-2x6 connector)
Modular
Alternatives
If this wattage isn't enough, look for PSUs with 1000W or higher. If you need even quieter operation or higher efficiency, search for models with Platinum or Titanium 80 Plus ratings and a focus on fanless or larger fan designs.
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