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JUSTOP Black ATX 500W PSU vs GameMax 800W Rampage Power Supply

Updated August 2026The GameMax 800W Rampage Power Supply outperforms the JUSTOP Black ATX 500W PSU in power output, efficiency, and build quality, making it the better choice for high-performance needs.

The GameMax 800W Rampage Power Supply outperforms the JUSTOP Black ATX 500W PSU in power output, efficiency, and build quality, making it the better choice for high-performance needs.

Why JUSTOP Black ATX 500W PSU is better

lower price

JUSTOP is more affordable at £22.50

basic usage

suitable for home/office PCs

compact size

smaller wattage for less demanding setups

Why GameMax 800W Rampage Power Supply is better

higher wattage

GameMax offers 800W for demanding tasks

efficiency certification

GameMax has 80 Plus Bronze certification

build quality

GameMax uses high-quality components

Overall score

JUSTOP Black ATX 500W PSU
65
GameMax 800W Rampage Power Supply
85

Specifications

SpecJUSTOP Black ATX 500W PSUGameMax 800W Rampage Power Supply
BrandJUSTOPGAMEMAX
Cooling Fan120mm14cm
CertificationNone80 Plus Bronze
ModularityFully WiredNon-Modular
Connectors20+4 pin, 4+4 pin, SATA x3Single 12V rail

Dimension comparison

JUSTOP Black ATX 500W PSUGameMax 800W Rampage Power Supply

Overview of Power Supplies

When comparing power supplies, the wattage and certification play crucial roles in performance and efficiency. The JUSTOP Black ATX 500W PSU offers a solid foundation for home and office PCs, while the GameMax 800W Rampage Power Supply caters to gaming enthusiasts with its higher wattage and efficiency credentials. Priced at £22.50, the JUSTOP unit provides essential capabilities for basic systems, whereas the GameMax, at £45.94, targets users seeking more power for demanding applications.

Power Output Comparison

The power output is a key differentiator between these two models. The JUSTOP Black ATX PSU delivers a maximum of 500W, suitable for standard setups without PCIe connectors. In contrast, the GameMax Rampage offers a significantly higher output of 800W, ideal for gaming rigs that require robust power delivery to high-performance components. This difference in wattage means that while the JUSTOP may suffice for basic tasks, the GameMax is designed to support more intensive operations, making it a better choice for gamers or users with high-performance needs.

Efficiency and Certification

Efficiency is another important factor to consider when comparing these power supplies. The GameMax Rampage boasts an 80 Plus Bronze certification, achieving up to 88% efficiency at a 50% load, which ensures that it operates effectively while minimising energy waste. In contrast, the JUSTOP PSU does not specify an efficiency certification, which may suggest it lacks the same level of energy optimisation. For users concerned about energy consumption and costs over time, the GameMax’s certification could lead to significant savings on electricity bills.

Cooling Solutions

Effective cooling is necessary to maintain the longevity and performance of power supplies. The JUSTOP Black ATX PSU features a 120mm cooling fan designed to keep temperatures in check, ensuring stable operation during typical usage scenarios. On the other hand, the GameMax Rampage is equipped with a larger 14cm cooling fan, which not only enhances airflow but also operates quietly, contributing to a better overall system environment. The larger fan size indicates potentially improved cooling efficiency, making the GameMax a preferable choice for high-performance setups that generate more heat.

Build Quality and Components

The build quality of a power supply can greatly affect its reliability. The GameMax Rampage is constructed using high-quality components, including a Japanese TK main capacitor, which provides a reliable life expectancy and quality assurance. This level of attention to component quality is often found in higher-end models, suggesting that the GameMax may offer better durability over time. Conversely, while the JUSTOP Black ATX PSU is certified for safety and offers essential features, it may not match the premium materials that define the GameMax, placing it at a disadvantage in terms of long-term reliability.

Design and Aesthetics

Aesthetics can also play a role in a user's decision, especially for those who build systems with visual appeal in mind. The GameMax Rampage uses flat black cables, enhancing the overall look of a PC build while promoting better cable management and airflow. The JUSTOP PSU, while sleek in its black finish, does not mention any specific design features aimed at aesthetic appeal. For users prioritising a clean and organised build, the GameMax offers a more visually appealing solution.

Connectivity Options

Connectivity is crucial for ensuring compatibility with various components. The JUSTOP Black ATX PSU features a range of connectors, including a 20+4 pin, 4+4 pin for CPU, and several SATA and Molex connections, accommodating a variety of PC configurations. The GameMax Rampage, while also providing a single 12V rail for high compatibility, focuses on delivering real gaming power through effective connectivity. The enhanced compatibility of the GameMax makes it a strong contender for users looking to build or upgrade gaming systems with multiple components.

Which should you buy?

Deciding between the JUSTOP Black ATX 500W PSU and the GameMax 800W Rampage Power Supply ultimately depends on your specific needs. If you're building a basic home or office PC and are looking for a cost-effective power supply, the JUSTOP at £22.50 provides adequate performance. However, for gamers or users with high-performance computers, the GameMax Rampage, priced at £45.94, offers superior wattage, efficiency, and build quality, making it the better investment for those who require reliability and power.

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JUSTOP Black ATX 500W PSU vs GameMax 800W Rampage Power Supply | versusfinder