be quiet! Pure Power 13 M 1000W Power Supply, 80 Plus® Gold Certification, ATX 3.1 PSU, Support for PCIe 5.1 GPUs, semi-Passive 120mm be quiet! Fan, LLC Technology, Single Rail, for Overclocked GPUs vs CORSAIR RM750e ATX 3.1 PCIe 5.1 Ready Fully Modular 750W Power Supply – 12V-2x6 Cable Included, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black

Power Output and Future-Proofing

The be quiet! Pure Power 13 M 1000W delivers significantly more power than the Corsair RM750e, offering 1000W of continuous output compared to the RM750e’s 750W. This makes the Pure Power 13 M better suited for high-end systems with multiple GPUs or overclocked components. Both PSUs support ATX 3.1 and PCIe 5.1, including the native 12V-2x6 connector for next-gen graphics cards, but the Pure Power 13 M is designed to handle transient power excursions up to double its rated power—ideal for intense workloads. The RM750e also supports PCIe 5.1 and includes a 12V-2x6 cable, ensuring compatibility with current and future GPUs. For users building powerful rigs that demand sustained high wattage, the Pure Power 13 M’s 1000W capacity offers greater headroom.

Efficiency and Energy Savings

Both PSUs are certified 80 PLUS Gold, meaning they maintain high efficiency under load. The be quiet! Pure Power 13 M boasts an efficiency rating of up to 94.4%, which translates into lower energy consumption and reduced electricity costs over time. The Corsair RM750e features Cybenetics Gold efficiency, also indicating strong performance, though the exact peak efficiency percentage isn’t specified. While both units offer similar efficiency tiers, the Pure Power 13 M’s higher maximum efficiency may result in slightly lower power draw at peak loads. This difference could lead to modest savings on electricity bills, especially in systems running continuously. Over time, these savings add up, making the Pure Power 13 M a more efficient choice despite its higher upfront cost.

Noise Management and Cooling Design

The be quiet! Pure Power 13 M features semi-passive zero-RPM cooling, meaning the fan shuts off entirely under low load conditions, contributing to near-silent operation. The 120mm be quiet! fan uses airflow-optimized blades and LLC technology for smooth, quiet performance even under heavy load. In contrast, the Corsair RM750e uses a 120mm rifle bearing fan with a specially calculated fan curve designed to minimize noise during full-load operation. While both units aim for quiet performance, the Pure Power 13 M’s ability to run fanless at idle provides a distinct advantage in silent system builds. The RM750e does not mention a zero-RPM mode, so it may produce audible noise even at low usage levels.

Cable Management and Build Flexibility

Both PSUs are fully modular, allowing users to connect only the cables needed for their build, which simplifies cable routing and improves airflow. The be quiet! Pure Power 13 M includes modular cabling with no unnecessary wires cluttering the case. Similarly, the Corsair RM750e is fully modular, enabling clean cable management. The RM750e comes with a 12V-2x6 cable and a 12V-2x6 to dual 8-pin PCIe adapter, supporting both current and future GPU needs. The Pure Power 13 M also includes multiple PCIe connectors, including 4 PCIe 6+2-pin options, along with a single 12V rail. Both units offer flexibility, but the Pure Power 13 M’s inclusion of four PCIe connectors gives it an edge for multi-GPU setups or systems with high-power demands.

Build Quality and Longevity

The Corsair RM750e uses 105°C-rated capacitors, which contribute to stable voltage delivery and improved reliability under stress. These industrial-grade components help ensure consistent performance over time. The be quiet! Pure Power 13 M does not specify capacitor temperature ratings, but it does feature LLC topology for superior voltage regulation and efficiency. While the RM750e explicitly highlights its use of high-temperature capacitors, the Pure Power 13 M relies on advanced circuitry instead. Both units are built for durability, but the RM750e’s emphasis on 105°C-rated capacitors adds a measurable quality assurance point. Additionally, the RM750e comes with a seven-year warranty, providing longer protection than what’s mentioned for the Pure Power 13 M.

Price and Value Comparison

The be quiet! Pure Power 13 M sells for $139.90, while the Corsair RM750e is priced at $89.99—a difference of $49.91, or about 36% cheaper. This price gap makes the RM750e significantly more affordable, especially for users who don’t need 1000W of power. The Pure Power 13 M offers greater wattage, higher efficiency, and semi-passive cooling, but at a steep premium. For budget-conscious builders or those with mid-tier hardware, the RM750e delivers excellent value with solid specs and competitive pricing. The Pure Power 13 M justifies its higher cost through superior power delivery and silence, but only if those features are essential.

Which should you buy?

Choose the be quiet! Pure Power 13 M 1000W if you’re building a high-end gaming or workstation PC with a demanding GPU, plan to overclock, or prioritize absolute silence—even at idle. Its 1000W output, semi-passive cooling, and ATX 3.1/PCIe 5.1 readiness make it ideal for future-proofing. However, if you’re on a tighter budget or your system doesn’t require more than 750W, the Corsair RM750e at $89.99 offers exceptional value. It matches the Pure Power 13 M in key areas like ATX 3.1 compliance, PCIe 5.1 support, and fully modular design, while adding 105°C-rated capacitors and a seven-year warranty. The RM750e is about 36% cheaper and still delivers reliable, efficient, and quiet performance—making it the smarter pick for most users.