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Sirlyr PSU Cable Extension Kit vs JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan

Updated August 2026The JUSTOP Black 700W Power Supply Unit is the better choice for reliable power and safety features, while the Sirlyr PSU Cable Extension Kit excels in aesthetics and cable management.

The JUSTOP Black 700W Power Supply Unit is the better choice for reliable power and safety features, while the Sirlyr PSU Cable Extension Kit excels in aesthetics and cable management.

Why Sirlyr PSU Cable Extension Kit is better

aesthetic design

Sirlyr offers an all-white design for modern builds.

cable management

Sirlyr includes pre-installed cable combs for organization.

lower price

Sirlyr is priced at £17.94, making it more affordable.

Why JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan is better

power output

JUSTOP provides a robust 700W capacity.

safety features

JUSTOP includes multiple protective features for safety.

cooling efficiency

JUSTOP has a 120mm quiet fan for better airflow.

Overall score

Sirlyr PSU Cable Extension Kit
70
JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan
85

Specifications

SpecSirlyr PSU Cable Extension KitJUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan
Power OutputN/A700W
Cooling FanN/A120mm
Safety FeaturesNoneOVP, OPP, SCP
Cable ManagementExcellentBasic
Price£17.94£29.95

Dimension comparison

Sirlyr PSU Cable Extension KitJUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan

Overview of the Products

When considering power supplies and cable extensions for your PC build, the Sirlyr PSU Cable Extension Kit and the JUSTOP Black 700W Power Supply Unit offer distinct advantages. The Sirlyr kit is priced at £17.94, focusing on aesthetic enhancements and cable management, while the JUSTOP power supply unit retails for £29.95 and provides reliable power output for your system. Each product serves different purposes, and understanding their features can help you decide which is best for your setup.

Design and Aesthetics

The Sirlyr PSU Cable Extension Kit is designed with an all-white appearance, ideal for users aiming for a clean and modern look in their builds. Its glossy white nylon braided cables enhance the overall aesthetic, making it a great choice for an all-white themed system. In contrast, the JUSTOP power supply features a traditional black casing, which may appeal to users who prefer a more classic or understated look. While both products have their unique designs, the Sirlyr kit stands out for those prioritising aesthetics, whereas the JUSTOP focuses on functionality.

Performance and Power Output

In terms of power output, the JUSTOP Black 700W Power Supply Unit clearly takes the lead with a robust 700W capacity. This power supply is designed to support a wide range of components, ensuring stability and efficiency for demanding systems. The Sirlyr PSU Cable Extension Kit, on the other hand, does not provide power but rather enhances existing cables. It is important to note that the Sirlyr kit can be used with power supplies ranging from 800W to 1600W, which indicates its compatibility with high-end setups, but it does not contribute to the overall power output.

Cable Management Features

The Sirlyr PSU Cable Extension Kit excels in cable management, featuring pre-installed transparent cable combs that allow for neat organisation of cables. The kit includes an additional set of combs for further customisation, making it easier to achieve a tidy and efficient setup. In contrast, the JUSTOP power supply unit provides essential connectors, including a 24-pin (535mm) and multiple SATA connections, but lacks the advanced cable management features of the Sirlyr kit. For users who value a clean and organised interior, the Sirlyr kit offers superior management capabilities.

Protection and Safety

Safety is paramount in any power supply system, and the JUSTOP Black 700W Power Supply Unit comes equipped with multiple protective features, including over voltage protection, over power protection, short circuit protection, and thermal overload cut-off protection. These features ensure a safer power output and protect your components from potential damage. The Sirlyr PSU Cable Extension Kit does not have protective features as it is not a power supply but rather an extension kit, highlighting the importance of choosing a reliable power supply like the JUSTOP for safeguarding your system.

Compatibility

The JUSTOP power supply is compatible with Intel ATX 12V v.2.3 and EPS 12V v.2.92 standards, making it a versatile choice for various builds. It includes a single 8-pin (4+4) 12V rail, offering more stability and safer power output. On the other hand, the Sirlyr PSU Cable Extension Kit is designed to work with power supplies ranging from 800W to 1600W, making it suitable for high-powered CPUs and GPUs. While both products are compatible with a variety of setups, the JUSTOP power supply unit stands out for its adherence to industry standards.

Cooling and Noise Levels

The JUSTOP Black 700W Power Supply Unit features a 120mm quiet cooling fan that ensures excellent airflow while maintaining low noise levels, rated at 40dBA. This is particularly beneficial for users who desire a silent operation in their systems. The Sirlyr PSU Cable Extension Kit, being a cable extension kit, does not have a cooling feature. Therefore, if cooling efficiency and noise reduction are significant factors for your build, the JUSTOP power supply unit is the clear choice.

Pricing and Value

The Sirlyr PSU Cable Extension Kit is priced at £17.94, providing a cost-effective solution for those looking to enhance their cable management and aesthetics. In comparison, the JUSTOP Black 700W Power Supply Unit is available for £29.95, offering extensive power output and safety features. While the Sirlyr kit presents a lower upfront cost, the JUSTOP power supply unit provides greater value in terms of reliable performance and safety, making it a worthy investment for serious builders.

Which should you buy?

Choosing between the Sirlyr PSU Cable Extension Kit and the JUSTOP Black 700W Power Supply Unit ultimately depends on your specific needs. If you are looking for an aesthetically pleasing solution to improve cable management in an existing setup, the Sirlyr kit is an excellent choice. However, if you require a reliable power supply that delivers stable output and includes essential safety features, the JUSTOP power supply unit is the better option. Each product has its strengths, so assess your priorities to make the best decision for your PC build.

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Sirlyr PSU Cable Extension Kit vs JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan | versusfinder