be quiet! Pure Power 12 650W PSU | 80 Plus Gold | vs CORSAIR RM750x Shift Fully Modular ATX Power
Updated August 2026 — be quiet! Pure Power 12 650W PSU | 80 Plus Gold | wins on price and efficiency, CORSAIR RM750x Shift Fully Modular ATX Power wins on cable and build.
The be quiet! Pure Power 12 offers better energy efficiency and lower noise levels, while the CORSAIR RM750x Shift excels in cable management and build quality. Choose based on your priorities.
Why be quiet! Pure Power 12 650W PSU | 80 Plus Gold | is better
Price
be quiet! is $15 cheaper
Efficiency
be quiet! has 92.7% efficiency
Noise
be quiet! features a quieter fan
Why CORSAIR RM750x Shift Fully Modular ATX Power is better
Cable Management
CORSAIR has a side cable interface
Build Quality
CORSAIR uses high-grade capacitors
Fan Size
CORSAIR has a larger 140mm fan
Overall score
Specifications
| Spec | be quiet! Pure Power 12 650W PSU | 80 Plus Gold | | CORSAIR RM750x Shift Fully Modular ATX Power |
|---|---|---|
| Power | 650W | 750W |
| Efficiency Rating | 80 PLUS Gold | 80 PLUS Gold |
| Fan Size | 120mm | 140mm |
| Modular | Fully Modular | Fully Modular |
| Connector Type | 12V-2x6 | Standard |
Dimension comparison
Overview of the Products
In this comparison, we will look at the be quiet! Pure Power 12 650W PSU and the CORSAIR RM750x Shift. While both power supplies offer reliable performance, they cater to slightly different user needs. The be quiet! model is priced at $64.90, making it about 17% cheaper than the CORSAIR RM750x Shift, which retails at $79.99. Let’s dive deeper into their features and specifications to see which might be the better choice for your system.
Power and Efficiency
Both the be quiet! Pure Power 12 and the CORSAIR RM750x Shift are 80 PLUS Gold certified, ensuring high efficiency during operation. The be quiet! model boasts an impressive efficiency rating of up to 92.7%, which translates to lower heat generation and energy costs. Conversely, the CORSAIR RM750x Shift is also designed to provide efficient power delivery but does not specify an exact efficiency percentage in the provided data. However, its compliance with ATX 3.1 standards allows it to handle transient power spikes effectively. If energy efficiency is your primary concern, the be quiet! unit takes the edge in terms of explicit efficiency metrics.
Compatibility with Graphics Cards
The be quiet! Pure Power 12 offers extensive compatibility with both current and next-generation graphics cards. It features a native 12V-2x6 connector designed for PCIe 5.1 GPUs, plus two additional PCIe 6+2-pin connectors. This versatility makes it a strong choice for users looking to future-proof their systems. On the other hand, the CORSAIR RM750x Shift is also compliant with PCIe 5.1 and ATX 3.1, ensuring a reliable connection for modern GPUs. Both power supplies excel in this category, but the be quiet! unit’s additional native connector provides a slight advantage for gamers looking to upgrade in the near future.
Noise Levels and Cooling
When it comes to noise levels, both models prioritize quiet operation. The be quiet! Pure Power 12 features a temperature-controlled 120mm fan designed for quiet performance, ensuring minimal noise even under heavy loads. The CORSAIR RM750x Shift utilizes a 140mm fluid dynamic bearing fan that is engineered for high performance with low noise. Additionally, the RM750x includes a Zero RPM mode which allows for virtually silent operation at low and medium loads. While both units are designed for quiet usage, the be quiet! model may still be preferable for users specifically focused on minimal noise output.
Build Quality and Reliability
The be quiet! Pure Power 12 comes with a 10-year warranty, highlighting the manufacturer’s confidence in its reliability and durability. In comparison, the CORSAIR RM750x Shift also offers a 10-year warranty and uses 100% 105°C-rated Japanese electrolytic capacitors, contributing to its long-term reliability. Both brands are well-regarded in the industry for their quality, but the specific emphasis on high-grade capacitors in the CORSAIR model might appeal more to users who prioritize premium components.
Cable Management and Installation
The installation process can significantly impact the overall user experience, and both power supplies have unique features to simplify this. The be quiet! Pure Power 12 comes with fully sleeved and flat modular cables, enhancing airflow and making installation easier. In contrast, the CORSAIR RM750x Shift introduces an innovative side cable interface, allowing for easier access to connections and better cable management. This feature can be particularly beneficial for users who frequently upgrade their systems. If ease of installation and cable management is a key concern, the CORSAIR model may provide a more user-friendly experience.
Aesthetic Appeal
Aesthetically, the be quiet! Pure Power 12 features a classic black design that fits seamlessly into most builds. The CORSAIR RM750x Shift stands out with its white finish, which can complement certain system themes. Additionally, the side interface design means that the cables can be hidden more effectively, potentially contributing to a cleaner look. Depending on your build’s color scheme and your personal preference for aesthetics, either option could be appealing.
Pricing Comparison
The be quiet! Pure Power 12 is priced at $64.90, making it a more budget-friendly option compared to the CORSAIR RM750x Shift, which costs $79.99. This price difference of about $15 may be significant for users on a tight budget. While both products offer high-quality features, the cost-effectiveness of the be quiet! model cannot be overlooked, particularly for gamers or builders looking to save money without sacrificing performance.
Which should you buy?
Choosing between the be quiet! Pure Power 12 and the CORSAIR RM750x Shift largely depends on your specific needs. If you prioritize energy efficiency, quieter operation, and a lower price point, the be quiet! model is likely the better fit for you. However, if ease of installation, innovative design, and high-quality internal components are more important, the CORSAIR RM750x Shift might be worth the extra investment. Both power supplies are excellent choices, but your individual priorities will determine the best option for your system.

