be quiet! BN514 Straight Power 12-750w Modular Power Supply | 80 Plus Platinum ATX 3.1 Compliant | for PCIe 5.0 GPUs and GPUs with 6+2 pin connectors | Silent 135mm be quiet! Fan | BN514
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AI Verdict
This 750W ATX 3.0/3.1, 80 PLUS Platinum modular power supply is for PC builders prioritizing quiet operation and future-proof GPU compatibility.
This 750W power supply is a strong fit for modern gaming or workstation PCs using PCIe 5.0 GPUs, thanks to its ATX 3.0/3.1 compliance and native 12VHPWR connector. Its 80 PLUS Platinum efficiency and Silent Wings fan directly address the need for stable, quiet power delivery in high-performance systems.
If you're running an RTX 4090 or plan on extreme overclocking, consider a higher wattage model in the Straight Power 12 series, like the 850W or 1000W versions.
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Pros
- 80 PLUS Platinum efficiency, up to 93.8%, means less wasted energy and cooler operation.
- ATX 3.0/3.1 compliance with a native 12VHPWR connector supports current and next-gen PCIe 5.0 GPUs.
- Virtually inaudible Silent Wings 135mm fan with a funnel-shaped opening provides high airflow and low noise.
- Japanese 105°C capacitors ensure stability and a 10-year manufacturer's warranty backs the unit.
- Handles massive power excursions up to double its rated power, preventing system instability.
- Fully modular cable management simplifies installation and improves case airflow.
Cons
- Some users reported audible coil whine under medium to high loads.
- The MSRP around $200 is considered expensive for a 750W unit by some users.
- A few users experienced unit failures within 17 months, though customer support was responsive.
Dimension Scores
It boasts 80 PLUS Platinum efficiency (up to 93.8%) and handles power excursions up to double its rated 750W with a single 12V rail.
The virtually inaudible Silent Wings 135mm fan and funnel-shaped opening are designed for quiet operation, though some users reported coil whine.
It uses Japanese 105°C capacitors and full bridge LLC technology, backed by a 10-year warranty, indicating high-quality components.
The fully modular design allows for maximum convenience and cleaner builds by only using necessary cables.
Best For
- Building a new PC with high-end, power-hungry PCIe 5.0 GPUs like an RTX 4070 or 7900 XT.
- Users who prioritize a quiet computing environment.
- System builders wanting a 10-year warranty for long-term reliability.
Not Recommended For
- Budget-focused builds where a lower efficiency or older ATX standard PSU would suffice.
- Users sensitive to high-pitched electronic noises, due to reported coil whine.
Watch Out For
- Some users reported coil whine, described as an 'audible and really annoying' high-pitched buzzing under medium to high loads.
- A few users experienced premature unit failure, with one Straight Power 11 dying after 17 months and another after just one month.
- The price point is a recurring concern, with some Reddit users finding $93 'way too expensive for a 750w unit' even with a promo code.
Full Specifications
| ASIN | B0CC8H91K8 |
| Brand | be quiet! |
| Series | BN514 |
| Wattage | 750 watts |
| Model Name | BN514 |
| Form Factor | ATX |
| Item Weight | 14.6 ounces |
| Manufacturer | be quiet! |
| Connector Type | ATX, PCI Express |
| Cooling Method | Air |
| Output Wattage | 12 Watts |
| Item model number | BN514 |
| Compatible Devices | Computing Systems |
| Product Dimensions | 6.3 x 5.91 x 3.39 inches |
| Item Dimensions LxWxH | 6.3 x 5.91 x 3.39 inches |
| Item dimensions L x W x H | 6.3 x 5.91 x 3.39 inches |
What Buyers Say
While generally praised for its quiet operation and high efficiency, a surprising number of users have reported coil whine, which can be a real buzzkill in an otherwise silent system. The price is also a sticking point for some, who feel it's a bit steep for a 750W unit, even with its Platinum rating and ATX 3.0 compliance. Despite these issues, the 10-year warranty and responsive customer support for replacements are frequently mentioned as positives.
“Man, this thing is QUIET, like, seriously quiet, but then sometimes I hear this faint high-pitched whine and it drives me nuts, especially when I'm just browsing.”
Common Praise
- The 135mm Silent Wings fan keeps the unit virtually inaudible under typical loads.
- The 80 PLUS Platinum efficiency rating (up to 93.8%) helps reduce power consumption.
- Native 12VHPWR connector and ATX 3.0/3.1 compliance make it ready for new GPUs.
- The 10-year warranty provides long-term peace of mind.
- Modular cables simplify installation and cable routing.
Common Complaints
- Audible coil whine reported by some users, especially under medium to high loads.
- The MSRP of around $200 is considered expensive for a 750W power supply.
- Some users experienced unit failures within a year or two of purchase.
Ownership Tips
- The fan really does stay off or spin very slowly most of the time, making your PC noticeably quieter.
- Cable quality feels premium, and the modularity makes building way less of a headache.
- Even with the high efficiency, the unit can still get warm under heavy gaming, but the fan rarely ramps up to an audible level.
- The 12VHPWR cable is stiff, which can be tricky for cable management in smaller cases.
Frequently Asked Questions
Is this PSU compatible with the latest graphics cards?
Yes, it's ATX 3.0/3.1 compliant and includes a native 12VHPWR connector, making it fully compatible with PCIe 5.0 GPUs. It also has 4 PCIe 6+2 pin connectors for older cards.
How quiet is this power supply?
It features a virtually inaudible Silent Wings 135mm fan and a funnel-shaped fan opening for high airflow, designed for quiet operation. Professional reviews confirm it runs quietly, even under load.
What kind of warranty does it come with?
The be quiet! BN514 Straight Power 12-750w comes with a 10-year manufacturer's warranty.
Is 750W enough for a high-end system?
For many high-end systems, including a 7800x3d and an RTX 4090, 750W can be sufficient. However, for the absolute highest-tier GPUs or heavily overclocked systems, a higher wattage might be recommended.
Does this PSU have modular cables?
Yes, it features fully modular cable management, which allows you to connect only the cables you need, improving case aesthetics and airflow.
Buying Guide
When you're picking a power supply, you're basically choosing the heart of your PC. It needs to deliver stable power to all your components without skipping a beat, especially with modern GPUs that can have sudden power spikes. Pay attention to the wattage for your total system needs, and the efficiency rating, which tells you how much power is wasted as heat. A higher efficiency means less heat and potentially lower electricity bills. Also, consider the ATX standard and connector types for future compatibility.
Wattage (750W)
80 PLUS Platinum efficiency
ATX 3.0/3.1 Compliant & PCIe 5.0
Modular
Alternatives
If this one doesn't fit, look for PSUs with a higher wattage (850W+) if you have a top-tier GPU or plan on heavy overclocking, or a lower efficiency rating (Gold) if you're on a tighter budget and don't mind slightly more heat and power consumption.
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