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JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan vs GameMax 800W Rampage Power Supply

Updated August 2026The GameMax 800W Rampage Power Supply offers higher wattage and better efficiency, making it the superior choice for high-performance builds.

The GameMax 800W Rampage Power Supply offers higher wattage and better efficiency, making it the superior choice for high-performance builds.

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

lower price

JUSTOP is £29.95 compared to GameMax's £45.94

quiet operation

JUSTOP operates at 40dBA

adequate connectors

JUSTOP has 6 SATA connectors

Why GameMax 800W Rampage Power Supply is better

higher wattage

GameMax provides 800W compared to JUSTOP's 700W

better efficiency

GameMax has 80 Plus Bronze certification

superior build quality

GameMax uses Japanese TK main capacitor

Overall score

JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan
70
GameMax 800W Rampage Power Supply
85

Specifications

SpecJUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet FanGameMax 800W Rampage Power Supply
Power Output700W800W
Efficiency70%88%
Cooling Fan12cm14cm
ProtectionOVP, UVP, OLPOVP, UVP, OLP
SATA Connectors6unknown

Dimension comparison

JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet FanGameMax 800W Rampage Power Supply

Overview of the Power Supplies

When comparing the JUSTOP Black 700W Power Supply Unit and the GameMax 800W Rampage Power Supply, both serve as solid choices for PC builders. However, they cater to slightly different needs and preferences. The JUSTOP unit is priced at £29.95, while the GameMax model comes in at £45.94, reflecting the differences in their specifications and features.

The JUSTOP Black 700W is designed for efficient performance with a focus on cooling and safety, featuring a 12cm quiet fan and multiple protection mechanisms. In contrast, the GameMax 800W Rampage offers higher wattage and a more robust efficiency rating with its 80 Plus Bronze certification, making it particularly appealing for high-performance gaming rigs.

Power Output and Efficiency

Power output is a critical factor when selecting a power supply, and in this comparison, the GameMax 800W Rampage leads with an 800W capacity. This higher output can accommodate more demanding components, making it suitable for gamers and high-performance PCs. The JUSTOP Black, with its 700W, while still substantial, may limit the potential of extremely power-hungry setups.

Efficiency is equally important, and the GameMax unit boasts an 80 Plus Bronze certification, ensuring up to 88% efficiency at 50% load. The JUSTOP, although efficient, only achieves a 70% rating. This means that the GameMax not only provides more power but does so with greater energy efficiency, potentially saving users money on electricity bills over time.

Cooling Solutions

Cooling is vital for maintaining system stability and longevity, and both power supplies incorporate effective cooling mechanisms. The JUSTOP Black features a 12cm quiet cooling fan, which is designed to minimise noise while providing sufficient airflow. This is particularly beneficial for builds prioritising quiet operation.

Conversely, the GameMax 800W Rampage is equipped with a larger 14cm cooling fan, which not only enhances airflow but also operates silently. This additional cooling capacity can be advantageous for high-performance systems that generate more heat. Users looking for optimal thermal management may find the GameMax's cooling solution to be superior.

Build Quality and Components

The build quality of a power supply can significantly affect its reliability and performance. The GameMax 800W Rampage stands out with its use of a Japanese TK main capacitor, which is known for its reliability and longevity. This feature suggests that the GameMax is built with higher-end components typically found in premium brands, enhancing its overall durability.

On the other hand, the JUSTOP Black is built to be a budget-friendly option without compromising essential safety features. It includes multiple protection mechanisms like over voltage, over power, and short circuit protection, ensuring a safe operating environment. While the materials may not match the premium feel of the GameMax, the JUSTOP still delivers adequate performance for standard builds.

Connectivity Options

Connectivity is crucial for ensuring compatibility with various components, and both power supplies offer a range of connectors. The JUSTOP Black 700W comes with a total of 6 SATA connectors, 3 Molex connectors, and a PCI-E connector, providing ample options for most standard setups.

In comparison, the GameMax 800W Rampage, while not explicitly detailed in connector types, emphasizes its single 12V rail for high compatibility and current output. This design simplifies power distribution across components, which can be particularly beneficial for high-performance gaming systems. Users may want to consider their specific connectivity needs when making a choice between these two models.

Aesthetics and Design

Aesthetics can play a significant role in a builder's choice of power supply, especially for those who value the visual appeal of their setups. The GameMax 800W Rampage features flat black cables, aiding in cable management and enhancing the overall look of a build. This attention to design can create a cleaner and more organised appearance.

On the other hand, the JUSTOP Black 700W maintains a straightforward design focused more on functionality than aesthetics. While it may not offer the same visual appeal as the GameMax, its simplicity ensures that it can fit into a variety of builds without issue. Builders prioritising aesthetics might lean towards the GameMax for its more polished look.

Noise Levels

Noise levels are often a concern for PC builders, especially those who aim for a quiet computing environment. The JUSTOP Black is designed with a 12cm cooling fan that operates quietly, rated at 40dBA, making it suitable for office or home environments where noise can be a distraction.

In contrast, while specific noise ratings for the GameMax Rampage are not provided, the inclusion of a 14cm fan suggests improved airflow and cooling efficiency, potentially leading to quieter operation in high-load scenarios. Nevertheless, the absence of a specified noise rating makes it difficult to directly compare with the JUSTOP’s explicit 40dBA rating. Users who are particularly sensitive to noise may want to consider this aspect carefully.

Which should you buy?

Choosing between the JUSTOP Black 700W Power Supply Unit and the GameMax 800W Rampage Power Supply ultimately depends on your specific needs and budget. If you are looking for a more affordable option that provides essential features and quiet operation, the JUSTOP at £29.95 is a solid choice. However, for those seeking higher power output, better efficiency, and robust build quality, the GameMax 800W Rampage at £45.94 stands out as the superior option, particularly for high-performance gaming setups. Consider your system requirements, budget, and personal preferences when making your decision.

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JUSTOP Black 700W Power Supply Unit ATX PSU With 120MM Quiet Fan vs GameMax 800W Rampage Power Supply | versusfinder