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be quiet! System Power 11 750W Power Supply vs GameMax 600W Rampage Power Supply

Updated August 2026The be quiet! System Power 11 750W Power Supply is the superior choice for high-performance systems, while the GameMax 600W Rampage Power Supply offers good value for budget builds.

The be quiet! System Power 11 750W Power Supply is the superior choice for high-performance systems, while the GameMax 600W Rampage Power Supply offers good value for budget builds.

Why be quiet! System Power 11 750W Power Supply is better

higher wattage

750W vs 600W power output

better efficiency

90% efficiency vs 88%

advanced connectors

native 12V-2x6 connector for next-gen GPUs

Why GameMax 600W Rampage Power Supply is better

lower price

priced at £34.95

sufficient for basics

adequate for basic gaming

good build quality

Japanese TK main capacitors

Overall score

be quiet! System Power 11 750W Power Supply
85
GameMax 600W Rampage Power Supply
65

Specifications

Specbe quiet! System Power 11 750W Power SupplyGameMax 600W Rampage Power Supply
Brandbe quiet!GAMEMAX
Certification80 PLUS Bronze80 PLUS Bronze
Fan Size120mm140mm
Connector Type12V-2x6Single 12V
Warranty5 years3 years

Dimension comparison

be quiet! System Power 11 750W Power SupplyGameMax 600W Rampage Power Supply

Price Comparison

The be quiet! System Power 11 750W Power Supply is priced at £64.99, while the GameMax 600W Rampage Power Supply comes in at a significantly lower price of £34.95. This £30.04 difference reflects the varying capacities and features between the two power supplies. The higher pricing of the System Power 11 can be justified by its additional wattage and advanced features, making it a more suitable choice for high-performance systems, especially for those with demanding graphics cards. In contrast, the Rampage’s lower price point makes it an appealing option for budget-conscious consumers or those with less intensive power requirements.

Power Output

When it comes to power output, the System Power 11 clearly leads with a robust 750W compared to the Rampage’s 600W. This additional power capacity allows the System Power 11 to handle more demanding components, making it a better choice for gaming rigs or systems with high-performance hardware. The System Power 11 is equipped to manage power excursions up to double its rated power, which is particularly beneficial during peak loads. The Rampage, while capable for standard gaming and basic systems, may struggle under heavier loads due to its lower output, limiting its effectiveness for power-hungry builds.

Efficiency Ratings

In terms of efficiency, both power supplies boast an 80 PLUS Bronze certification, indicating they achieve a respectable level of energy efficiency. The System Power 11 has an efficiency rating of up to 90.0%, while the Rampage achieves up to 88% at 50% load. This slight edge in efficiency for the System Power 11 not only highlights its superior design but also suggests potential savings on electricity bills over time. Users who prioritise energy efficiency alongside performance may find the System Power 11 to be the superior investment in the long run.

Cooling Solutions

The cooling solutions differ significantly between the two units. The System Power 11 features a temperature-controlled 120mm quality fan, which ensures low noise operation and effective cooling performance, a hallmark of the be quiet! brand. This design is particularly beneficial for users who require a quiet environment. On the other hand, the Rampage utilises a 14cm ultra-silent cooling fan, which also aims to deliver effective cooling. While both fans are designed to keep the PSUs cool, the System Power 11's focus on minimal noise may appeal more to those building a silent PC setup, whereas the Rampage offers a slightly larger fan size which can help with airflow and cooling efficiency.

Build Quality and Components

The build quality of a power supply can dramatically affect its reliability and lifespan. The System Power 11 is designed for stability and dependability, ensuring consistent power delivery even under heavy loads. It includes safety protections against overcurrents, undervoltages, and short circuits, which are crucial for safeguarding valuable components. The Rampage also emphasizes build quality, featuring Japanese TK main capacitors that are known for their reliability and longevity. However, while both PSUs are built with quality components, the System Power 11’s additional safety features may provide added peace of mind for users investing in higher-end components.

Compatibility

In terms of compatibility, the System Power 11 is equipped with a native 12V-2x6 connector specifically for next-generation PCIe 5.1 graphics cards, alongside standard PCIe 6+2-pin connectors, making it versatile for current and future builds. This compatibility ensures that users can easily integrate high-performance GPUs without concerns about power delivery. The Rampage’s single 12V rail also offers high compatibility for various components, but it lacks the advanced connector options seen in the System Power 11. Thus, for users planning on upgrading to the latest graphics technology, the System Power 11 is likely the more future-proof choice.

User Experience

Customer experience can greatly influence the choice of a power supply. The System Power 11 is well-regarded for its quiet operation, efficient power delivery, and robust safety features, making it a favourite among enthusiasts and those seeking a reliable power source for demanding builds. On the other hand, the Rampage appeals to users looking for a cost-effective solution that still delivers sufficient power for basic gaming and everyday tasks. While it may not have the same level of acclaim as the System Power 11, it still offers solid performance for its price, making it a practical option for entry-level builds.

Which should you buy?

Choosing between the be quiet! System Power 11 750W Power Supply and the GameMax 600W Rampage Power Supply ultimately depends on your specific needs and budget. If you require a high-capacity PSU that supports cutting-edge components, operates quietly, and includes robust safety features, the System Power 11 at £64.99 is the clear winner. However, if you are looking for a more budget-friendly option that can handle basic gaming and everyday tasks, the Rampage at £34.95 offers good value for money. Your decision should reflect your power requirements, future upgrade plans, and how much you are willing to invest in a power supply.

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be quiet! System Power 11 750W Power Supply vs GameMax 600W Rampage Power Supply | versusfinder