NZXT C850 Gold ATX 3.1 - Fully Modular Low-Noise PC Gaming Power Supply - 850 Wa vs Sirlyr PSU Cable Extension Kit
Updated August 2026 — The NZXT C850 Gold ATX 3.1 is a superior choice for those needing a reliable power supply, while the Sirlyr PSU Cable Extension Kit is ideal for enhancing aesthetics and cable management.
The NZXT C850 Gold ATX 3.1 is a superior choice for those needing a reliable power supply, while the Sirlyr PSU Cable Extension Kit is ideal for enhancing aesthetics and cable management.
Why NZXT C850 Gold ATX 3.1 - Fully Modular Low-Noise PC Gaming Power Supply - 850 Wa is better
Power Delivery
Provides stable power for high-performance components.
Noise Levels
Features an ultra-low noise fan for quiet operation.
Build Quality
Constructed with premium Japanese capacitors for reliability.
Why Sirlyr PSU Cable Extension Kit is better
Price
More affordable option for budget-conscious builders.
Aesthetics
Offers a visually appealing all-white design.
Cable Management
Includes pre-installed cable combs for organization.
Overall score
Specifications
| Spec | NZXT C850 Gold ATX 3.1 - Fully Modular Low-Noise PC Gaming Power Supply - 850 Wa | Sirlyr PSU Cable Extension Kit |
|---|---|---|
| Wattage | 850W | N/A |
| Noise Mode | Zero Fan Mode | N/A |
| Cable Type | Fully Modular | Extension Kit |
| Connector Quality | Premium Capacitors | Gold-Plated |
| Max Load | 600W for GPU | N/A |
Dimension comparison
Overview of Power Supplies and Accessories
When it comes to powering your PC, selecting the right components is crucial for optimal performance. The NZXT C850 Gold ATX 3.1 power supply and the Sirlyr PSU Cable Extension Kit are two products that cater to different needs within the PC building community. Priced at £84.90, the NZXT C850 promises stability and efficiency, while the Sirlyr extension kit is a more affordable option at £17.94, designed to enhance cable management and aesthetics.
Performance and Efficiency
The NZXT C850 Gold ATX 3.1 stands out with its compliance to the ATX 3.1 standard, ensuring that it provides stable power to high-performance components. It is particularly noted for its ability to deliver up to 600 watts to NVIDIA GeForce RTX 50 Series graphics cards, making it a strong choice for gamers and creators. In contrast, while the Sirlyr PSU Cable Extension Kit does not provide power itself, it is designed for use with power supplies ranging from 800W to 1600W, ensuring that it can support high power demands when paired with a suitable PSU.
Noise Levels and Cooling
The NZXT C850 features an ultra-low noise 135mm fluid dynamic bearing fan, which operates silently under 50% load thanks to its Zero Fan Mode. This design is particularly beneficial for those who prioritise a quiet gaming or working environment. On the other hand, the Sirlyr extension kit does not impact noise levels directly, as it is merely an accessory for managing cables. However, a well-organised setup can indirectly contribute to a quieter system by improving airflow.
Build Quality and Materials
Quality construction is a hallmark of the NZXT C850, which incorporates 100% premium Japanese capacitors. This choice of materials enhances hold-up time and reduces ripple noise, ensuring reliable and stable power delivery. The Sirlyr extension kit, while not a power supply, boasts gold-plated terminals that facilitate stable current transmission and minimise power loss. Its 16 AWG thickened alloy copper core matches high PC power supply standards, promising durability and reliability when extending power cables.
Aesthetics and Design
The visual appeal of your PC build can be significantly enhanced by the right accessories. The Sirlyr PSU Cable Extension Kit features an all-white design, complemented by glossy nylon braided cables that lend a premium look to any desktop setup. Each cable also includes pre-installed transparent cable combs for efficient management. In contrast, the NZXT C850, while functional and efficient, does not specifically focus on aesthetics, prioritising performance over style.
Compatibility and Use Cases
The NZXT C850 is designed for users seeking a reliable power supply for high-end systems, particularly those using the latest graphics cards. Its capability to handle power spikes and maintain stability makes it suitable for gamers and content creators alike. Conversely, the Sirlyr PSU Cable Extension Kit is ideal for anyone looking to tidy up their existing power setup, especially those who may have older power supplies that need a visual upgrade without replacing the entire unit.
Price and Value for Money
At £84.90, the NZXT C850 provides a comprehensive solution for power needs, making it a valuable investment for those who require a robust and efficient power supply. Meanwhile, the Sirlyr PSU Cable Extension Kit, priced at £17.94, offers an economical way to enhance the aesthetics and management of your existing power cables, making it an attractive option for budget-conscious builders.
Which should you buy?
The decision between the NZXT C850 Gold ATX 3.1 power supply and the Sirlyr PSU Cable Extension Kit ultimately depends on your specific needs. If you require a high-performance power supply with low noise and reliable power delivery, the NZXT C850 is the clear choice. However, if you are looking to improve cable management and aesthetics without the need for a new power supply, the Sirlyr extension kit is an excellent option. Consider your priorities in power delivery versus visual appeal to make the best choice for your PC build.
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