Corsair HX1000i Fully Modular Ultra-Low Noise ATX vs CORSAIR RM850x Fully Modular Low-Noise ATX Power

Overview of the Corsair HX1000i

The Corsair HX1000i is a premium power supply unit (PSU) that combines advanced features with high efficiency. Priced at $234.99, this fully modular ATX power supply is designed for enthusiasts who demand the best performance from their systems. It is compliant with the ATX 3.1 standard and supports PCIe 5.1, making it suitable for the latest hardware configurations.

The HX1000i also boasts an impressive 80 PLUS Platinum efficiency rating, ensuring lower energy consumption and heat generation. Its 140mm fluid dynamic bearing fan is built for quiet operation, and the power supply includes features like the Zero RPM Fan Mode, which shuts off the fan at low loads to enhance silence. Additionally, the CORSAIR iCUE software allows for custom fan curves and power monitoring, making it a versatile choice for PC builders.

Overview of the Corsair RM850x

The CORSAIR RM850x is another excellent offering from Corsair, priced at $161.93, making it about 31% cheaper than the HX1000i. This fully modular power supply is also compliant with the ATX 3.1 standard and supports PCIe 5.1, ensuring compatibility with modern graphics cards.

With a Cybenetics Gold efficiency rating, the RM850x operates at up to 91% efficiency, which translates to reduced power consumption and cooler temperatures compared to standard power supplies. The unit features a native 12V-2x6 connector for direct GPU connection, eliminating the need for adapters. Its design includes embossed cables with low-profile combs for easy installation and a streamlined appearance.

Power Efficiency Comparison

When it comes to power efficiency, the Corsair HX1000i takes the lead with its 80 PLUS Platinum rating. This designation means the unit can achieve over 90% efficiency at typical loads, translating to less wasted energy and heat. In contrast, the RM850x, with its Cybenetics Gold certification, achieves up to 91% efficiency, which is commendable but slightly lower than the HX1000i.

The difference in efficiency ratings may not seem significant at first glance, but for power users and gamers who run high-performance systems, these percentages can influence overall energy costs and thermal performance. Hence, while the HX1000i is more efficient, the RM850x still offers excellent performance for its price point.

Noise Levels and Cooling

Noise levels are a critical factor for many PC builders, and here is where the HX1000i shines. The 140mm fluid dynamic bearing fan provides exceptionally quiet operation, especially in low and medium loads due to the Zero RPM Fan Mode, which completely turns off the fan in these scenarios. This feature ensures that the HX1000i operates silently during regular use, making it ideal for quiet builds.

The RM850x, while also designed for low noise, relies on a standard 140mm FDB fan. It delivers quiet cooling but does not offer a Zero RPM mode. While it performs admirably in noise control, the HX1000i’s additional features for silence make it more appealing for users who prioritize a tranquil computing environment.

Modular Design and Build Quality

Both power supplies feature a fully modular design, allowing users to connect only the necessary cables for a cleaner build. However, the HX1000i's build quality is often regarded as superior due to its use of 105°C-rated Japanese electrolytic capacitors, which contribute to longevity and reliability.

The RM850x also employs high-quality components, including 100% Japanese capacitors, but the HX1000i's extended warranty of ten years compared to the RM850x's equivalent assurance reflects a slight edge in confidence regarding durability. This difference can be a deciding factor for users looking for longevity in their investment.

Software and Monitoring Capabilities

The Corsair HX1000i comes with powerful CORSAIR iCUE software, enabling users to create custom fan curves and monitor power settings. This software provides added control over the power supply, allowing for real-time adjustments and performance tracking. It also offers features like toggling between single and multi-rail overcurrent protection, which can enhance safety and performance.

Conversely, the RM850x does not include such extensive software capabilities, which may limit its appeal for users who want to fine-tune their system's performance. The absence of dedicated monitoring software means users of the RM850x might miss out on advanced functionalities that could optimize their power supply performance.

Target Audience and Use Cases

The HX1000i is targeted at high-end gamers and professionals who require top-tier performance and efficiency. Its features cater to power users who run demanding applications or gaming setups with multiple GPUs. The additional cost is justifiable for those who want the best technology available.

On the other hand, the RM850x presents a compelling option for mainstream users and gamers who seek a balance between performance and price. Its slightly lower efficiency and lack of advanced software features make it more suitable for users who do not push their systems to the extreme but still want a reliable and efficient power supply.

Which should you buy?

Choosing between the Corsair HX1000i and the RM850x ultimately depends on your specific needs and budget. If you are looking for top-notch efficiency, advanced software capabilities, and superior cooling features, the HX1000i is the clear winner at $234.99. However, if you prefer a more budget-friendly option that still delivers solid performance and reliability, the RM850x at $161.93 is about 31% cheaper and offers excellent value for most users. Each power supply has its strengths, so consider your priorities before making a purchase.