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be quiet! Power Zone 1000W Power Supply vs JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan

Updated August 2026The be quiet! Power Zone 1000W is the superior choice for high-performance systems, while the JUSTOP Black 700W is a budget-friendly option for basic needs.

The be quiet! Power Zone 1000W is the superior choice for high-performance systems, while the JUSTOP Black 700W is a budget-friendly option for basic needs.

Why be quiet! Power Zone 1000W Power Supply is better

Power Output

1000W vs 700W

Efficiency Rating

80 PLUS Platinum vs 70%

Cooling Solution

140mm fan vs 120mm fan

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

Price

£29.95 vs £143.99

Basic Protection

Includes essential protections

Size

More compact for basic builds

Overall score

be quiet! Power Zone 1000W Power Supply
85
JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan
55

Specifications

Specbe quiet! Power Zone 1000W Power SupplyJUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan
Brandbe quiet!JUSTOP
Wattage1000W700W
Efficiency80 PLUS Platinum70%
Cooling Fan Size140mm120mm
Protection FeaturesAdvancedBasic
Price£143.99£29.95

Dimension comparison

be quiet! Power Zone 1000W Power SupplyJUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan

Overview

When comparing the be quiet! Power Zone 1000W Power Supply and the JUSTOP Black 700W Power Supply Unit, the most striking difference is their power output. The be quiet! model offers a significant 1000W, while the JUSTOP provides 700W, making it better suited for high-performance systems. This substantial power difference suggests that the be quiet! model is more capable of supporting demanding components such as high-end graphics cards and processors.

The be quiet! Power Zone is priced at £143.99, reflecting its premium features and capabilities. In contrast, the JUSTOP model is a budget option at just £29.95, aimed at users looking for a reliable power supply without the need for extensive power output or advanced features. This price disparity indicates that each product targets different segments of the market.

Power Output

Power output is a crucial factor when selecting a power supply unit, and here, the be quiet! Power Zone 1000W clearly excels. With 1000W of continuous power on a single massive 12V rail, it can handle power excursions effectively, making it suitable for high-performance systems requiring substantial energy. The JUSTOP Black 700W, while adequate for less demanding builds, may struggle under heavy loads due to its lower output. This difference means that gamers or professionals using high-end components should consider the be quiet! option for its superior power handling capabilities.

Efficiency Ratings

Efficiency is another critical aspect, especially for users concerned about energy consumption and operating costs. The be quiet! Power Zone boasts an impressive 80 PLUS Platinum certification, achieving up to 94% efficiency. This high rating contributes to lower power consumption and cooler operation, which is beneficial for long-term use. Conversely, the JUSTOP Black 700W offers a lower efficiency rating of 70%. This means that while the JUSTOP is a more economical choice upfront, users may face higher energy costs over time, especially if used in a power-hungry system.

Cooling Solutions

Both power supplies implement cooling solutions, but they differ significantly in their design and effectiveness. The be quiet! Power Zone is equipped with a large Pure Wings 3 140mm fan that operates quietly and only activates under heavy load, ensuring a silent experience during regular use. This advanced cooling design promotes longevity and stability. On the other hand, the JUSTOP Black features a 12CM cooling fan, which, while it does provide airflow, lacks the same level of sophistication. Users may experience more noise during operation with the JUSTOP, making the be quiet! a preferable choice for those seeking a quieter system.

Protection Features

Protection features are essential for safeguarding components from power-related issues. The be quiet! Power Zone includes top-tier protection measures, including support for next-generation PCIe graphics cards, which is crucial for future-proofing. In contrast, the JUSTOP Black 700W also offers key protections, such as over voltage, over power, and short circuit protection, but lacks the advanced features of its competitor. While both units provide basic safety measures, the be quiet! option is designed to cater to high-end builds that demand robust protection under heavy loads.

Compatibility

Compatibility with various components is vital for ensuring seamless integration into different systems. The be quiet! Power Zone supports ATX 3.1 and includes multiple PCIe connectors, making it versatile for current and future graphics cards. It also includes a 90° angled 12V-2x6 connector, facilitating easier installation. The JUSTOP Black 700W adheres to Intel ATX 12V v.2.3 and EPS 12V v.2.92 standards, making it compatible with a wide array of components. However, the lack of multiple PCIe connectors may limit its use in more demanding setups. Users looking to build high-performance systems should consider the wider compatibility options available with the be quiet! model.

Target Audience

The target audience for these two power supplies diverges significantly based on their specifications and pricing. The be quiet! Power Zone is tailored for enthusiasts and professionals who need a reliable, high-power solution for gaming, content creation, or other demanding tasks. Its high price reflects its premium features and performance capabilities. Conversely, the JUSTOP Black 700W is aimed at budget-conscious consumers or casual users who require a basic power supply for standard computing tasks. This clear distinction in target markets underscores the importance of assessing one’s needs before making a purchase.

Which should you buy?

Ultimately, the choice between the be quiet! Power Zone 1000W and the JUSTOP Black 700W Power Supply Unit hinges on your specific requirements and budget. If you are building a high-performance system that demands robust power and efficiency, the be quiet! model is the clear winner at £143.99. Its advanced features, high efficiency, and superior power output justify the price for serious users. However, if you are looking for a cost-effective solution for a standard build, the JUSTOP Black at £29.95 provides adequate power and essential protections without breaking the bank. Your decision should reflect the balance between performance needs and budget constraints.

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