Corsair RM1200x Shift Fully Modular ATX Power vs CORSAIR RM850x Fully Modular Low-Noise ATX Power

Overview

When comparing power supplies, two models from Corsair stand out: the Corsair RM1200x Shift and the Corsair RM850x. The RM1200x Shift is priced at $194.99, while the RM850x is more affordable at $161.93—about 17% cheaper. Both models feature fully modular designs and compliance with ATX 3.1 standards, making them suitable for modern gaming and high-performance PCs.

Design and Build Quality

The design of the Corsair RM1200x Shift features a unique side cable interface, allowing for convenient connectivity and reducing cable clutter. With 105°C-rated Japanese electrolytic capacitors, it emphasizes reliability and longevity. In contrast, the RM850x, while also boasting a fully modular design, utilizes embossed cables with low-profile combs for a sleek look. Both power supplies are constructed to meet high standards, but the RM1200x Shift’s innovative interface gives it an edge in ease of installation and aesthetics.

Performance and Efficiency

In terms of performance, the RM1200x Shift offers 80 PLUS Gold efficiency, ensuring a high level of power conversion efficiency. Meanwhile, the RM850x is Cybenetics Gold-certified, rated for up to 91% efficiency. This slight edge in efficiency means that the RM850x can lead to lower power consumption and cooler operating temperatures. However, both models are designed to handle transient power spikes effectively, thanks to their ATX 3.1 compliance.

Cooling Solutions

The cooling solutions of these power supplies are designed for optimal performance. The RM1200x Shift features a 140mm fluid dynamic bearing fan that operates in Zero RPM mode at low and medium loads, providing near-silent operation. Conversely, the RM850x also employs a 140mm fan for cooling, which is designed for low noise levels. Both fans prioritize quiet operation, but the RM1200x Shift’s Zero RPM feature may offer a more silent experience during less demanding tasks.

Compatibility and Connectivity

Both power supplies excel in compatibility, supporting the latest graphics cards with PCIe 5.1 connections. The RM1200x Shift's advanced side connector layout allows for easy accessibility, while the RM850x includes a native 12V-2x6 connector, eliminating the need for adapters. This specificity can be critical for users with high-end GPUs. Ultimately, both models provide excellent connectivity options for contemporary PC builds, each with its unique advantages.

Warranty and Support

Corsair backs both the RM1200x Shift and the RM850x with a ten-year warranty, illustrating the company's confidence in their reliability and longevity. This long-term support ensures that users can trust these power supplies for years of dependable performance. While warranty length is the same, the overall build quality and innovative features of the RM1200x Shift may offer a slight advantage for those seeking long-term reliability.

Price Point

The RM1200x Shift is priced at $194.99, making it a premium option compared to the RM850x, which costs $161.93. This represents a difference of about $33.06, and consumers must consider whether the additional features of the RM1200x Shift justify the higher price. For users on a budget, the RM850x presents an attractive alternative without compromising essential performance metrics.

Which should you buy?

Deciding between the Corsair RM1200x Shift and the RM850x largely depends on your specific needs and budget. If you prioritize innovative design, superior accessibility, and advanced cooling features, the RM1200x Shift may be worth the extra investment at $194.99. However, for those seeking a reliable, efficient power supply at a lower cost, the RM850x at $161.93 stands out as an excellent choice. Both power supplies offer robust performance, but your decision should align with your performance requirements and budget constraints.