CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply vs Gigabyte UD850GM PG5 ICE 80 Plus Gold Fully Modular 850w PCIe 5.0 White Power Su
Updated August 2026 — The Corsair RM850x excels in aesthetics and noise levels, while the Gigabyte UD850GM PG5 ICE offers better value and protection features. Choose based on your priorities.
The Corsair RM850x excels in aesthetics and noise levels, while the Gigabyte UD850GM PG5 ICE offers better value and protection features. Choose based on your priorities.
Why CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply is better
Noise Level
Corsair RM850x focuses on low-noise operation.
Aesthetics
Corsair features sleek embossed cables.
Efficiency
Corsair has a slightly higher efficiency rating.
Why Gigabyte UD850GM PG5 ICE 80 Plus Gold Fully Modular 850w PCIe 5.0 White Power Su is better
Price
Gigabyte is more economical at £99.61.
Protection Features
Gigabyte has extensive safety protections.
Compact Size
Gigabyte is designed to save space.
Overall score
Specifications
| Spec | CORSAIR RM850x Fully Modular Low-Noise ATX Power Supply | Gigabyte UD850GM PG5 ICE 80 Plus Gold Fully Modular 850w PCIe 5.0 White Power Su |
|---|---|---|
| Wattage | 850W | 850W |
| Certification | Cybenetics Gold | 80 PLUS Gold |
| Modularity | Fully Modular | Fully Modular |
| Cooling | Low-Noise Fan | Smart Hydraulic Fan |
| Protection | Standard | Multiple Protections |
Dimension comparison
Price Comparison
When it comes to pricing, the Gigabyte UD850GM PG5 ICE is the more economical choice, retailing at £99.61 compared to the Corsair RM850x, which is priced at £124.40. This represents a significant difference of £24.79, making the Gigabyte option more attractive for budget-conscious consumers. Both power supplies offer similar wattage at 850W, yet the cost-effectiveness of the Gigabyte makes it a strong contender for those looking to save without compromising on quality.
Build Quality and Design
Both power supplies feature a fully modular design, which allows users to connect only the necessary cables, reducing clutter and enhancing airflow within the case. The Corsair RM850x includes embossed cables with low-profile combs, providing a sleek look and ease of installation. In contrast, the Gigabyte UD850GM PG5 ICE boasts compact dimensions and is equipped with 100% Japanese capacitors, which are known for their durability and reliability. While both units are well-constructed, the use of high-quality components in the Gigabyte may offer an assurance of longevity.
Efficiency Ratings
Efficiency is a crucial factor for power supplies, and both products excel in this area. The Corsair RM850x is Cybenetics Gold-Certified, achieving up to 91% efficiency, which translates into lower power consumption and reduced noise levels. The Gigabyte UD850GM PG5 ICE is also 80 PLUS Gold certified, ensuring high efficiency. While the Corsair has a slight edge in efficiency rating, the differences are marginal, with both models designed to provide energy savings and environmentally friendly operation.
Cooling Solutions
Effective cooling is vital in maintaining optimal performance and longevity of power supplies. The Corsair RM850x uses low-noise components that contribute to a quieter operation, which is a significant advantage for users seeking a silent build. On the other hand, the Gigabyte UD850GM PG5 ICE features a 120mm smart hydraulic bearing fan that is designed for optimized thermal performance. This fan is engineered to adjust speed based on temperature, ensuring that the power supply remains cool during heavy loads. While both cooling solutions are effective, the Corsair's focus on low noise may appeal more to those prioritising a quiet computing experience.
Compatibility Features
Compatibility with modern hardware is essential in today's computing landscape. The Corsair RM850x is ATX 3.1 compliant and supports PCIe 5.1, ensuring it can handle the latest graphics cards without the need for adapters. This feature is particularly beneficial for gamers and high-performance users. Similarly, the Gigabyte UD850GM PG5 ICE is also Intel ATX 3.1 and PCIe Gen 5.1 ready, making it equally adept at supporting cutting-edge hardware. Both power supplies offer excellent compatibility, but the Corsair's native connector for direct GPU connection may provide an added level of convenience for some users.
Protection Features
Safety and protection features are crucial for safeguarding both the power supply and connected components. The Gigabyte UD850GM PG5 ICE excels with multiple protection mechanisms, including OVP, OPP, SCP, UVP, OCP, and OTP. These features protect the PSU from over-voltage, over-current, and other potentially damaging conditions. The Corsair RM850x, while not explicitly detailing as many protection features, is built to be reliable and efficient with its high-quality components. Users who value enhanced safety may find the extensive protection features of the Gigabyte to be a considerable advantage.
User Experience
User experience is often shaped by the installation process and the product's operation over time. The Corsair RM850x's fully modular design and low-profile cables ease the installation process, making it a user-friendly option for both novices and seasoned builders. The emphasis on low noise also contributes to a more pleasant computing environment. The Gigabyte UD850GM PG5 ICE, with its compact size and smart fan, promises effective cooling and space-saving installation. While both provide good user experiences, the Corsair may be slightly preferable for those who prioritise aesthetics and silence.
Which should you buy?
Ultimately, the choice between the Corsair RM850x and the Gigabyte UD850GM PG5 ICE will hinge on personal priorities. If budget is a primary concern, the Gigabyte offers a compelling price point of £99.61 and excellent protection features. However, for those who value aesthetics, low noise, and slightly higher efficiency, the Corsair RM850x at £124.40 may be worth the extra investment. Both power supplies are solid choices, but your specific needs and preferences will determine the best fit for your build.
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