be quiet! Pure Power 12 M 850W Modular Power Supply | 80 Plus® Gold | ATX 3.1 | PCIe 5.0 GPUs and 6+2 pin connectors | 12VHPWR Cable Included | Silent 120mm be quiet! Fan - BN505 I 10 Year Warranty
Want the best price and purchase timing?
Our AI advisor analyzes real-time pricing across all channels to find you the best deal.
AI Verdict
An 850W 80 Plus Gold ATX 3.1 fully modular power supply with a 120mm silent fan, ready for PCIe 5.1 GPUs.
This 850W 80 Plus Gold ATX 3.1 power supply is a strong fit for modern, high-performance PC builds, especially those featuring PCIe 5.1 GPUs, due to its native 12V-2x6 600W connector and ability to handle significant power excursions. Its fully modular design and quiet 120mm fan also cater to users valuing clean builds and low noise.
If you're running a less demanding system, consider a lower wattage Pure Power 12 M model to save money without sacrificing features like ATX 3.1 compliance.
Regret Score™
Very Low RiskLower is better — measures purchase-regret risk from real buyer complaints, review credibility, and product maturity
Issues discovered after purchase
Critically weak dimension
Amazon rating vs actual quality
Chance this product isn't for you
Pros
- Achieves up to 93.0% efficiency with its 80 Plus Gold certification, reducing energy waste.
- Supports ATX 3.1 and PCIe 5.1 with a native 12V-2x6 600W connector and four PCIe 6+2 connectors.
- Delivers 850W continuous power with dual 12V rails, handling transient power spikes up to 2000W.
- Features a temperature-controlled 120mm fan with airflow-optimized blades for near-silent operation.
- Offers fully modular cabling, simplifying installation and improving internal case airflow.
- Comes with a 10-year manufacturer's warranty.
Cons
- Includes only two SATA/Molex power cables despite having three corresponding ports on the PSU.
- GPU cables are described by one user as visually unappealing, resembling those from cheaper power supplies.
- The 850W output might be overkill for systems without high-end, power-hungry GPUs.
Dimension Scores
Achieves up to 93.0% efficiency with 80 Plus Gold certification and provides 850W continuous power with dual 12V rails, handling 2000W transient spikes.
Features a silence-optimized 120mm be quiet! fan with temperature control and airflow-optimized blades for near-silent operation.
Backed by a 10-year warranty, indicating manufacturer confidence in its durability and component quality.
Offers fully modular cabling for a clean build, though one user noted a discrepancy in SATA/Molex cable count versus ports.
Best For
- Gaming PCs with current or next-gen PCIe 5.1 graphics cards requiring a 12V-2x6 600W connector.
- Workstation setups demanding stable 850W continuous power and tolerance for 2000W transient spikes.
- Noise-conscious users building a PC where quiet operation is a priority.
- PC builders prioritizing clean internal aesthetics and simplified cable management with fully modular cables.
Not Recommended For
- Budget PC builds with low-power components that won't utilize 850W.
- Users needing more than two SATA/Molex power cables without purchasing additional ones.
- Small form factor (SFF) PC cases, as it uses a standard ATX form factor.
Watch Out For
- The power supply has three ports for SATA/Molex cables, but only two cables are included in the box, potentially requiring an extra purchase if you have many drives.
- One user reported the included GPU cables look 'ugly' and 'belong on a much cheaper PSU,' which might clash with a premium build aesthetic.
Full Specifications
| ASIN | B0BVY62M5F |
| Brand | be quiet! |
| Wattage | 850 watts |
| Model Name | BN505 |
| Form Factor | ATX |
| Item Weight | 6.96 pounds |
| Manufacturer | be quiet! |
| Connector Type | ATX |
| Cooling Method | Air |
| Output Wattage | 850 Watts |
| Item model number | BN505 |
| Compatible Devices | PC |
| Product Dimensions | 5.91 x 3.39 x 6.3 inches |
| Power Supply Design | Full Modular |
| Item dimensions L x W x H | 5.91 x 3.39 x 6.3 inches |
What Buyers Say
Users frequently highlight the power supply's quiet operation, even under heavy loads, as a significant advantage. The 850W continuous power delivery and ability to handle transient spikes are also consistently mentioned as providing stable performance for demanding systems. However, a specific complaint surfaced regarding the inclusion of only two SATA/Molex cables for three available ports, which can be an inconvenience for users with multiple drives. The aesthetic of the GPU cables was also criticized by one user, describing them as looking cheap.
“This thing is super quiet and powerful, no issues at all with my setup, but seriously, why give me three ports for SATA and only two cables? And those GPU cables, yikes.”
Common Praise
- Provides clean power to components without issues.
- Operates with near-silent fan noise, even during intense use.
- Handles demanding gaming and workstation loads with stable 850W continuous power.
- Fully modular design simplifies cable routing and improves case airflow.
- Future-proof with ATX 3.1 and PCIe 5.1 support for new GPUs.
Common Complaints
- Only two SATA/Molex power cables are supplied, despite three ports being present on the unit.
- GPU cables are perceived as visually 'ugly' and not matching the quality of the PSU itself.
Ownership Tips
- The fan remains acoustically unobtrusive even when the system is under significant load.
- Cable routing is straightforward due to the fully modular design, but plan for extra SATA/Molex cables if you have many peripherals.
- The 12VHPWR cable is included and works as expected for compatible GPUs.
Frequently Asked Questions
Is this power supply compatible with the latest graphics cards?
Yes, it's ATX 3.1 compliant and PCIe 5.1 compatible, featuring a native 12V-2x6 600W connector and four PCIe 6+2 connectors for current and next-gen GPUs.
How quiet is this power supply?
It features a silence-optimized 120mm be quiet! fan with temperature-controlled speed adjustments and airflow-optimized blades, designed for near-silent performance even under heavy loads.
Does it come with all the necessary cables?
It includes a 12VHPWR cable and PCIe 6+2 connectors. However, one user noted it has three ports for SATA/Molex cables but only supplies two cables.
What is the warranty period for this power supply?
The be quiet! Pure Power 12 M 850W comes with a 10-year manufacturer's warranty.
Can this PSU handle power spikes from demanding components?
Yes, it's designed to handle transient power spikes up to 2000W, providing stable performance for demanding gaming and workstation setups.
Buying Guide
When you're looking at a power supply, you're essentially picking the heart of your PC. It needs to deliver enough stable power for all your components, especially your graphics card and CPU, without making a racket or wasting electricity. Pay attention to wattage for your total system needs, efficiency ratings for lower electricity bills, and modularity for easier building and better airflow.
Wattage (850W)
This is the total power the PSU can supply. Think of it like the horsepower of an engine; too little, and your PC won't run or will crash under load. 850W is plenty for most high-end gaming rigs, especially with modern GPUs.
80 Plus Gold
This is an efficiency rating. Gold means it converts at least 87-90% of the AC power from your wall into usable DC power for your PC, wasting less as heat. Higher efficiency means lower electricity bills and less heat inside your case.
ATX 3.1 & PCIe 5.1
These are the latest standards for power supplies, crucial for compatibility with new, power-hungry graphics cards. ATX 3.1 ensures the PSU can handle rapid power spikes, and PCIe 5.1 means it has the correct, dedicated connector (12V-2x6) for modern GPUs, preventing adapter headaches.
Fully Modular
This refers to the cables. Fully modular means you only plug in the cables you need. It's like having custom-length hoses for your garden – less clutter, better airflow inside your PC case, and a much cleaner build.
Alternatives
If 850W is too much for your current setup, look for power supplies with lower wattage (e.g., 650W or 750W) that still maintain ATX 3.1 compliance and 80 Plus Gold efficiency. If you need more SATA/Molex cables out of the box, check product reviews or specifications for models that include a higher count.
You Might Also Like
Micro ATX PC Case | Mini Tower Computer case | Pre-Installed 120mm*1 RGB Fan | ITX Desktop Chassis for MATX/ITX | 240 RAD | 280mm GPU | 160mm CPU Cooler Height - White S6
$0-$49This MAQUY S6 is a budget Micro ATX case with a pre-installed 120mm RGB fan, supporting 280mm GPUs and 240mm top radiators for entry-level builds.
Micro ATX Case, Mini PC ITX Desktop Computer Case MATX Case Support ATX PSU/250mm GPU/135mm CPU Cooler/1x 3.5’’HDD or 2X 2.5’’SSD/USB 3.0 Port
$0-$49This is a compact 38.5x19.5x32.5cm Micro ATX case supporting 250mm GPUs and 135mm CPU coolers, designed for budget workstation builds.
Small PC Case, ITX Mini Computer Case with 360 Degree Ventilation, 10.5L Compact Design for ITX Motherboard, SFX Power Supply, 4 x 2.5 Inch SSDs
$50-$99This 10.5L acrylic ITX case supports SFX/SFX-L PSUs, ITX motherboards, and GPUs up to 210mm, designed for compact builds.
Micro ATX PC Case | Mini Tower Computer case Support Vertical GPU Mount | Pre-Installed 120mm*1 RGB Fan | ITX Desktop Chassis for MATX/ITX | 240 RAD | 320mm GPU | 165mm CPU Cooler Height-Black
$0-$49A budget Micro ATX case with a mesh front, tempered glass, and support for 320mm GPUs and 240mm AIOs, but only one pre-installed 120mm RGB fan.