be quiet! Straight Power 12-1500w Modular Power vs CORSAIR RM750e ATX 3.1 PCIe 5.1 Ready Fully
Updated July 2026 — be quiet! Straight Power 12-1500w Modular Power wins on power and warranty, CORSAIR RM750e ATX 3.1 PCIe 5.1 Ready Fully wins on price and size.
The be quiet! Straight Power 12 is superior for high-performance needs, while the CORSAIR RM750e offers great value for budget builds.
Why be quiet! Straight Power 12-1500w Modular Power is better
Power Output
1500W vs 750W
Efficiency
80 PLUS Platinum vs Gold
Warranty
10 years vs 7 years
Why CORSAIR RM750e ATX 3.1 PCIe 5.1 Ready Fully is better
Price
$89.99 vs $254.99
Size
More compact design
Noise
Lower cost with decent noise levels
Overall score
Specifications
| Spec | be quiet! Straight Power 12-1500w Modular Power | CORSAIR RM750e ATX 3.1 PCIe 5.1 Ready Fully |
|---|---|---|
| Wattage | 1500W | 750W |
| Efficiency Rating | 80 PLUS Platinum | Cybenetics Gold |
| Fan Size | 135mm | 120mm |
| Capacitors | Japanese 105°C | 105°C |
| Modularity | Fully Modular | Fully Modular |
Dimension comparison
Overview of the Products
In this comparison, we will examine the be quiet! Straight Power 12-1500w Modular Power Supply and the CORSAIR RM750e ATX 3.1 PCIe 5.1 Ready Fully Modular 750W Power Supply. The be quiet! model is priced at $254.99, while the CORSAIR option is significantly cheaper at $89.99, making it about 65% less expensive. Each power supply comes with its own set of features catering to different user needs, making this comparison crucial for potential buyers.
Power Output Comparison
The be quiet! Straight Power 12 offers a powerful 1500W output, making it ideal for high-performance systems that demand substantial power, especially for next-gen GPUs. In contrast, the CORSAIR RM750e provides 750W, which is adequate for most mid-range builds. This difference in wattage means that if you plan on running multiple high-end components, the be quiet! model is better suited for such tasks. However, for users with less demanding setups, the CORSAIR's output may suffice.
Efficiency Ratings
When it comes to efficiency, the be quiet! Straight Power 12 boasts an impressive 80 PLUS Platinum certification, achieving up to 93.9% efficiency. This high efficiency can lead to lower electricity bills over time. On the other hand, the CORSAIR RM750e is Cybenetics Gold certified, which is still good but not as efficient as the Platinum rating. Therefore, while both power supplies offer effective energy use, the be quiet! model has a clear edge in terms of efficiency.
Noise Levels
Noise is an essential factor for many PC builders, especially those who prefer a quieter environment. The be quiet! Straight Power 12 incorporates a Silent Wings 135mm fan that operates virtually inaudibly, thanks to its optimized design. Conversely, the CORSAIR RM750e features a 120mm rifle bearing fan that aims to keep noise levels low, but it may not match the almost silent performance of the be quiet! model. For users prioritizing quiet operation, the be quiet! option is likely the better choice.
Compatibility and Features
The be quiet! Straight Power 12 includes native support for PCIe 5.0 graphics cards and has four PCIe 6+2 pin connectors for current-gen GPUs. This versatility makes it an excellent choice for users planning to upgrade their systems in the future. The CORSAIR RM750e, while PCIe 5.1 ready, also supports modern builds but lacks the same level of future-proofing as the be quiet! model. If compatibility with the latest technology is paramount, the be quiet! power supply stands out.
Build Quality and Components
Both power supplies incorporate high-quality components, but the be quiet! model takes the lead with its Japanese 105°C capacitors, which ensure reliability and stability. The CORSAIR RM750e also features 105°C-rated capacitors, which are reliable but are not highlighted to the same degree as in the be quiet! product. The be quiet! power supply promises a longer lifespan due to its superior internal design, making it a more robust investment for high-performance systems.
Warranty and Longevity
The be quiet! Straight Power 12 comes with a generous 10-year manufacturer’s warranty, reflecting the brand's confidence in its product's longevity. In comparison, the CORSAIR RM750e offers a seven-year warranty, which, while still commendable, is shorter than that of the be quiet! model. The longer warranty period of the be quiet! power supply may provide peace of mind for buyers concerned about potential failures over time.
Pricing and Value
The be quiet! Straight Power 12 is priced at $254.99, while the CORSAIR RM750e is available for $89.99, making it about 65% cheaper. For budget-conscious buyers or those with less demanding systems, the CORSAIR power supply represents a better value. However, for users requiring high performance, efficiency, and future-proofing, the investment in the be quiet! model may be justified. The price difference suggests that both products cater to different segments of the market.
Which should you buy?
The choice between the be quiet! Straight Power 12 and the CORSAIR RM750e ultimately depends on your specific needs and budget. For high-end builds requiring substantial power, exceptional efficiency, and quiet operation, the be quiet! model is the clear winner. However, if you are looking for a reliable, budget-friendly option for a mid-range system, the CORSAIR RM750e provides excellent value without compromising on essential features. Evaluate your requirements carefully to make the right decision for your setup.

