be quiet! Pure Power 13 M 1000W Power Supply vs CORSAIR RM1200x SHIFT Fully Modular ATX Power Supply - 80 PLUS Gold - ATX 3.1 -
Updated August 2026 — The be quiet! Pure Power 13 M offers excellent value with high efficiency and lower price, while the CORSAIR RM1200x SHIFT provides advanced features at a premium.
The be quiet! Pure Power 13 M offers excellent value with high efficiency and lower price, while the CORSAIR RM1200x SHIFT provides advanced features at a premium.
Why be quiet! Pure Power 13 M 1000W Power Supply is better
price
be quiet! is £99.99 compared to CORSAIR's £174.98
efficiency
be quiet! has a higher efficiency rating of 94.4%
quiet operation
be quiet! features a fan that turns off at low loads
Why CORSAIR RM1200x SHIFT Fully Modular ATX Power Supply - 80 PLUS Gold - ATX 3.1 - is better
modularity
CORSAIR has fully modular micro-fit connectors
design
CORSAIR offers innovative side-mounted connections
component quality
CORSAIR uses 105°C-rated Japanese capacitors
Overall score
Specifications
| Spec | be quiet! Pure Power 13 M 1000W Power Supply | CORSAIR RM1200x SHIFT Fully Modular ATX Power Supply - 80 PLUS Gold - ATX 3.1 - |
|---|---|---|
| Brand | be quiet! | Corsair |
| Certification | 80 PLUS Gold | 80 PLUS Gold |
| Fan Size | 120mm | 140mm |
| Rail Design | Single 12V | Multiple |
| Connector Type | Standard | Micro-Fit |
Dimension comparison
Overview of Power Supplies
In the realm of power supplies, the be quiet! Pure Power 13 M 1000W Power Supply and the CORSAIR RM1200x SHIFT Fully Modular ATX Power Supply present two compelling options. The be quiet! model is priced at £99.99, whereas the CORSAIR alternative is significantly more expensive at £174.98. Both products are certified 80 PLUS Gold, ensuring high efficiency, but their designs and features cater to different user needs and preferences.
Efficiency and Performance
The be quiet! Pure Power 13 M boasts an impressive efficiency rating of up to 94.4%, which translates to lower power consumption and reduced operational costs. This model is designed to deliver 1000W of continuous power, featuring a single massive 12V rail that can handle power excursions effortlessly. In contrast, the CORSAIR RM1200x SHIFT, while also 80 PLUS Gold certified, focuses on its Intel ATX 3.1 certification, making it resistant to transient power spikes. It leverages premium components, including 105°C-rated Japanese electrolytic capacitors, for reliable performance. Both supplies promise efficiency, but the be quiet! model edges ahead with a higher continuous power rating at a lower price.
Design and Build Quality
The build quality of both power supplies is commendable, with the be quiet! model emphasising silent operation and effective cooling. It features a fan that turns off at low loads, contributing to a quieter system. On the other hand, the CORSAIR RM1200x SHIFT introduces an innovative design with side-mounted modular connections, promoting easier access and cleaner cable management. Its 140mm fluid dynamic bearing fan is optimised for high performance and low noise. While both designs focus on efficiency and cooling, the CORSAIR’s unique connection layout could appeal to those prioritising aesthetics and space management.
Connectivity and Modularity
Connectivity is a crucial aspect where these two power supplies diverge. The be quiet! Pure Power 13 M includes native integration for the 12V-2x6 connector, supporting next-generation PCIe 5.1 graphics cards, alongside four PCIe 6+2-pin connectors for current GPUs. This versatility makes it an excellent choice for future-proofing. Conversely, the CORSAIR RM1200x SHIFT’s fully modular micro-fit connectors allow users to attach only the cables they need, resulting in a less cluttered build. This feature is particularly beneficial for those who want a streamlined setup, but it does come at a higher price point.
Cooling Solutions
Cooling performance is essential for maintaining system stability and longevity. The be quiet! Pure Power 13 M is designed with airflow-optimised fan blades to ensure quiet operation across varying loads, which is a significant advantage for users building silent systems. The fan also remains off during low loads, conserving energy and reducing noise. The CORSAIR RM1200x SHIFT, with its 140mm fluid dynamic bearing fan, employs a specially calculated fan curve for optimal performance and reliability. Both units offer effective cooling solutions but cater to slightly different priorities: silence versus performance.
Pricing and Value
When it comes to pricing, the be quiet! Pure Power 13 M is positioned at £99.99, making it a budget-friendly option for those seeking a high-quality power supply. In stark contrast, the CORSAIR RM1200x SHIFT retails at £174.98, which reflects its advanced features and high-end components. While the CORSAIR offers excellent reliability and innovative design, the price difference raises the question of value for many users. For those focused on performance without breaking the bank, the be quiet! model presents a compelling argument for its lower price and robust features.
Target Audience
The target audience for these power supplies differs based on their features and price points. The be quiet! Pure Power 13 M is ideal for gamers and PC builders who require a powerful, efficient, and quiet solution without spending excessively. It’s particularly suitable for users building systems aimed at media creation or gaming. Conversely, the CORSAIR RM1200x SHIFT is geared towards enthusiasts and professionals who demand top-tier performance, advanced features, and are willing to invest more for these benefits. Its design caters to users who appreciate innovative cable management and superior component quality.
Which should you buy?
Choosing between the be quiet! Pure Power 13 M and the CORSAIR RM1200x SHIFT ultimately depends on your specific needs and budget. If your priority is a cost-effective, efficient, and quiet power supply that delivers robust performance, the be quiet! model is a clear winner at £99.99. However, if you value advanced features, superior design, and are prepared to invest more for enhanced reliability, the CORSAIR model, with its price tag of £174.98, may be worth considering. Each power supply has its strengths, but the decision hinges on whether you prioritise price or premium features.
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