be quiet! BN517 Straight Power 12-1200w 80 Plus Platinum, ATX 3.0, Modular Power Supply, for PCIe 5.0 GPUs and GPUs with 6+2 pin connectors, Silent 135mm be quiet! Fan - BN517
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AI Verdict
This 1200W 80 Plus Platinum ATX 3.0 PSU with a 135mm Silent Wings fan supports PCIe 5.0 GPUs and offers fully modular cabling.
This 1200W ATX 3.0 power supply with 80 Plus Platinum efficiency and PCIe 5.0 support is designed for high-performance desktop systems. Its modular cabling and silent 135mm fan cater to users building powerful, quiet machines.
If 1200W is more than your system needs, look for a lower wattage Straight Power 12 model to save money without sacrificing features.
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Pros
- Achieves 80 PLUS Platinum efficiency up to 93.9%.
- Features ATX 3.0 and PCIe 5.0 GPU support, capable of handling power excursions up to double its rated power.
- Incorporates a virtually inaudible Silent Wings 135mm fan with a 6-pole motor and fluid-dynamic bearing.
- Utilizes Full bridge LLC technology for unmatched signal stability.
- Equipped with Japanese 105°C capacitors, ensuring stability and reliability.
- Offers fully modular cable management for maximum convenience during installation.
Cons
- Some users reported the cables are stiff, making routing challenging in certain cases.
- The included PCIe cable configuration was found limiting by some users for specific GPU setups.
- A small percentage of users (12%) experienced power output stability issues.
- One user reported the PSU shutting down within 5-45 minutes when installed inside a case.
- Concerns were raised by some users regarding the manufacturing change to HEC from FSP.
Dimension Scores
Achieves 80 PLUS Platinum certification with up to 93.9% efficiency and handles power excursions up to double its rated power.
Features a virtually inaudible Silent Wings 135mm fan with a 6-pole motor and fluid-dynamic bearing.
Utilizes Japanese 105°C capacitors for stability and reliability, backed by a 10-year warranty.
Offers fully modular cable management for convenience, though some users report stiff cables.
Best For
- High-end PC builds with power-hungry PCIe 5.0 GPUs.
- Systems where quiet operation under load is a priority.
- Users prioritizing energy efficiency with 80 Plus Platinum certification.
- Custom PC builders who value modular cable management for a clean aesthetic.
Not Recommended For
- Compact Small Form Factor (SFF) builds due to potential cable stiffness and routing difficulties.
- Budget-conscious builds where 1200W and Platinum efficiency are beyond requirements.
Watch Out For
- Cables are reportedly stiff, making them difficult to bend and route, especially in smaller PC cases.
- A small percentage of users (12%) experienced power output stability issues, which could lead to system instability.
- One user reported the PSU shutting down when installed inside a case, suggesting potential thermal or compatibility issues in specific setups.
- The manufacturing change to HEC from FSP raised quality concerns for some users, despite the 10-year warranty.
Full Specifications
| ASIN | B0CC88BCG9 |
| Brand | be quiet! |
| Series | BN517 |
| Wattage | 12 watts |
| Model Name | BN517 |
| Form Factor | ATX |
| Item Weight | 8.95 pounds |
| Manufacturer | be quiet! |
| Connector Type | ATX |
| Cooling Method | Air |
| Output Wattage | 1200 |
| Item model number | BN517 |
| Compatible Devices | Desktop |
| Product Dimensions | 7.09 x 5.91 x 3.39 inches |
| Item Dimensions LxWxH | 7.09 x 5.91 x 3.39 inches |
| Item dimensions L x W x H | 7.09 x 5.91 x 3.39 inches |
What Buyers Say
Many users highlight the quiet operation, noting the 135mm Silent Wings fan keeps noise levels minimal even under load. The 80 Plus Platinum efficiency is frequently mentioned as a benefit for power consumption and system cooling. While the modular cables are appreciated for build cleanliness, some users found them stiff, making routing challenging in compact cases. A small fraction of users reported issues with the power supply's stability under load or unexpected shutdowns when installed in a case.
“Man, this thing is SO quiet, I literally can't hear it over my case fans, even when my 4090 is chugging away. Cables are a pain to bend though, felt like I was gonna break something trying to route them in my mid-tower.”
Common Praise
- Fan remains quiet even when the system is under heavy load.
- High energy efficiency, reaching up to 93.9%.
- Modular cables simplify system building and improve airflow.
- Handles power spikes from modern GPUs without issues.
- Internal layout contributes to effective cooling for a given fan speed.
- The single 12V rail provides stable power delivery.
Common Complaints
- Cables are stiff, making them difficult to bend and route in some cases.
- Some users experienced the PSU shutting down when installed inside a case.
- A small percentage of users (12%) reported power output stability issues.
- Concerns raised about the change in OEM to HEC from FSP.
- The included PCIe cable configuration was found limiting by some.
Ownership Tips
- The fan profile is tuned to spin quite slowly, contributing to its quietness.
- Active Power Factor Correction (PFC) approaches 0.99 with nominal load.
- The 120ms power good signal is within ATX 3.0 specifications for Alternative Sleep Mode.
- The internal wire-free design helps cool components and extends lifespan.
Frequently Asked Questions
Does this PSU support the new PCIe 5.0 GPUs?
Yes, it has full support for PCIe 5.0 GPUs, including handling massive power excursions.
Is the power supply quiet during operation?
Yes, it features a virtually inaudible Silent Wings 135mm fan designed for quiet cooling and high airflow.
What is the efficiency rating of this power supply?
It has an 80 PLUS Platinum certification, delivering up to 93.9% power efficiency.
Are the cables modular?
Yes, it offers fully modular cable management for maximum convenience and a cleaner build.
What kind of capacitors does it use?
It uses high-quality Japanese 105°C capacitors, ensuring stability and reliability.
What is the warranty period?
It comes with a 10-year manufacturer's warranty.
Buying Guide
When you're picking a power supply, think of it as the heart of your PC; it needs to deliver consistent, clean power to all your components. Wattage is how much power it can supply, and 1200W is for serious gaming rigs or workstations. Efficiency ratings like 80 Plus Platinum tell you how much power is wasted as heat – higher efficiency means less wasted energy and less heat inside your case.
ATX 3.0 & PCIe 5.0 Support
This means the PSU is built for modern, power-hungry graphics cards, especially those that can draw a lot of power in short bursts. It's like having a power outlet that can handle a sudden surge from a high-wattage appliance without tripping the breaker.
80 PLUS Platinum Efficiency
This certification means the power supply converts at least 90% of the power from your wall into usable PC power at 20% load, 92% at 50% load, and 89% at 100% load. Less wasted energy means lower electricity bills and less heat generated inside your computer.
Modular Cable Management
Instead of having all cables permanently attached, modular PSUs let you only plug in the cables you need. This reduces clutter inside your PC case, improves airflow, and makes building or upgrading your system much easier.
Silent Wings 135mm Fan
The fan cools the power supply. A larger, high-quality fan like this one can move more air at lower RPMs, meaning it keeps the PSU cool without making a lot of noise. It's like having a big, slow-spinning ceiling fan instead of a small, whiny desk fan.
Alternatives
If you don't need 1200W or the absolute quietest operation, look for PSUs with lower wattage and an 80 Plus Gold rating, or consider models with a smaller form factor if you're building a compact PC.
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