Corsair RM750x 80 PLUS Gold Fully Modular ATX 750 Watt Power Supply Review

The Corsair RM750x is a high-performance power supply unit (PSU) designed to meet the needs of modern gaming systems and high-end PC builds. Here is a detailed review of its features, performance, and overall value.

Performance

The RM750x boasts an 80 PLUS Gold certification, indicating its high efficiency in converting AC power to DC. During cold testing, the PSU demonstrates excellent efficiency, with a nominal load efficiency of 89.6% at 115 VAC and 91.9% at 230 VAC. However, under hot testing conditions, the efficiency drops to 88.1% at 115 VAC and 90.4% at 230 VAC, which is still within acceptable limits but results in the loss of Platinum certification.

Voltage Regulation and Ripple Suppression

The RM750x exhibits excellent voltage regulation, with the 5V rail showing a deviation of 0.5%, the 3.3V rail at 0.4%, and the 12V rail at 0.7%. This ensures stable output under various load conditions. Ripple suppression is also impressive, with maximum ripple values of 34 mV on the 12V line, 16 mV on the 5V line, and 16 mV on the 3.3V line, which are almost a quarter of what the design guide dictates to be the limit.

Fan Performance

The RM750x features a 135mm magnetic levitation fan, which is designed to operate quietly and efficiently. The fan activates much sooner than during cold testing, starting almost immediately when the load surpasses 100 watts. It progressively increases speed with the load, reaching near its maximum speed under sustained heavy loads. Although the fan becomes loud when the unit is heavily loaded, it is well-balanced between thermal performance and acoustics for a PSU of this class.

Modular Design and Cable Management

The fully modular design of the RM750x is a significant advantage for cable management. It allows users to connect only the necessary cables, minimizing clutter and maximizing airflow inside the PC case. This results in a clean and organized build with improved cooling capabilities.

Protection Features

The RM750x includes essential protection mechanisms such as Over Current Protection (OCP), Over Voltage Protection (OVP), Over Power Protection (OPP), and Short Circuit Protection (SCP). All these protection mechanisms were activated and functioned correctly during testing, ensuring the safety and reliability of the system.

Compatibility and Build Quality

The RM750x is designed with compliance to the ATX 3.1 standard, making it compatible with modern hardware. It includes high-power connectors such as 2x EPS (2x cables), 2x PCIe 6+2 pin (2x cables), and 1x PCIe 12+4 pin (600W). The use of all-Japanese capacitors is a hint at the designer's aim to ensure durability, and Corsair’s choice of components overall suggests a unit built for reliability and long-term performance.

Drawbacks

While the RM750x shines in many areas, there are some drawbacks to consider. At a retail price of $120, it sits in a competitive segment where other units offer similar or slightly better features for a lower cost. Its Gold certification is adequate but can be considered lacking compared to what is available at this price point. Additionally, while the overall design and performance are solid, it does not break new ground compared to earlier models, offering more of an incremental update rather than a major leap forward.

Verdict

The Corsair RM750x is a dependable power supply with modern features and strong performance. For those needing an ATX 3.1-compliant PSU with a focus on stability and quiet operation, it is a solid option. However, budget-conscious users may be looking elsewhere or waiting for a sale. Despite its drawbacks, the RM750x remains a reliable choice for mid-to-high-end PC builds due to its excellent voltage regulation, efficient fan operation, and robust build quality.

Features Table