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be quiet! Straight Power 12-1500w Modular Power vs Seasonic CORE GX 650W Power Supply ATX 3.1 PCIe

Updated August 2026 — be quiet! Straight Power 12-1500w Modular Power leads on noise level and power output.

The be quiet! Straight Power 12 offers superior performance and efficiency, making it ideal for high-end systems, while the Seasonic CORE GX is a budget-friendly option for mid-range builds.

Why be quiet! Straight Power 12-1500w Modular Power is better

Power Output

1500W vs 650W

Efficiency Rating

80 Plus Platinum vs Gold

Warranty

10 years vs 7 years

Why Seasonic CORE GX 650W Power Supply ATX 3.1 PCIe is better

Price

$99.99 vs $254.99

Size

More compact for mid-range builds

Basic Features

Adequate for most users

Overall score

be quiet! Straight Power 12-1500w Modular Power
90
Seasonic CORE GX 650W Power Supply ATX 3.1 PCIe
70

Specifications

Specbe quiet! Straight Power 12-1500w Modular PowerSeasonic CORE GX 650W Power Supply ATX 3.1 PCIe
Brandbe quiet!Seasonic
ModelStraight Power 12CORE GX
Certification80 Plus Platinum80 Plus Gold
Connector Type12VHPWR12V-2x6
Fan TypeSilent WingsStandard

Dimension comparison

be quiet! Straight Power 12-1500w Modular PowerSeasonic CORE GX 650W Power Supply ATX 3.1 PCIe

Price Comparison

When it comes to pricing, the Seasonic CORE GX 650W Power Supply is significantly more affordable at $99.99 compared to the be quiet! Straight Power 12-1500w Modular Power Supply, which retails for $254.99. This price difference of approximately 61% makes the Seasonic model a more attractive option for budget-conscious consumers. While the be quiet! power supply is designed for high-end systems, the Seasonic offers a good balance of performance and cost, making it suitable for mid-range builds.

Power Output

The be quiet! Straight Power 12 boasts a substantial output of 1500W, significantly higher than the 650W offered by the Seasonic CORE GX. This means that the Straight Power 12 is capable of supporting more power-hungry components and can handle power excursions with ease. In contrast, the Seasonic's 650W rating is adequate for most mid-range systems, but it may limit users looking to upgrade to higher-end GPUs or additional components in the future.

Efficiency Ratings

Efficiency is a crucial factor when selecting a power supply, and the be quiet! Straight Power 12 stands out with its 80 Plus Platinum certification, achieving up to 93.9% efficiency. This translates to lower energy consumption and less heat generation during operation. The Seasonic CORE GX, while still commendable, holds an 80 Plus Gold certification. This means it operates at about 87% efficiency, making the be quiet! model a better choice for users focused on maximizing power efficiency.

Modular Design

Both power supplies feature modular designs, allowing for customizable cable management. The be quiet! Straight Power 12 offers a fully modular setup, enabling users to connect only the cables they need, resulting in a cleaner build and improved airflow. The Seasonic CORE GX also presents a fully modular solution, which is advantageous for organization and aesthetics. However, the Straight Power 12 includes additional features like a funnel-shaped fan inlet designed to enhance airflow, which may lead to improved cooling performance over prolonged use.

Compatibility with Next-Gen GPUs

When it comes to compatibility with next-generation components, the be quiet! Straight Power 12 shines with its native integration of the 12VHPWR connector, making it ready for PCIe 5.0 GPUs. This is particularly relevant for users aiming to build high-performance gaming rigs. The Seasonic CORE GX is also PCIe 5.1 ready but does not feature the same level of compatibility for the latest graphics cards. This gives the be quiet! model an edge for future-proofing your system.

Noise Levels

Noise considerations are essential for many users, especially those who value a quiet computing experience. The be quiet! Straight Power 12 is equipped with a high-end Silent Wings fan designed to operate with minimal noise, making it virtually inaudible during standard operation. While the Seasonic CORE GX does not provide specific noise level ratings, it is known for efficient cooling. However, without the specialized fan technology present in the be quiet! model, it may not achieve the same low noise levels under heavy loads.

Warranty and Reliability

Reliability is a key aspect of any power supply, and both brands offer solid warranty periods. The be quiet! Straight Power 12 comes with a generous 10-year manufacturer’s warranty, reflecting confidence in its long-term performance and durability. In comparison, the Seasonic CORE GX offers a 7-year warranty, which is still commendable but falls short of the assurance provided by be quiet!. This longer warranty period from be quiet! may be a deciding factor for users prioritizing longevity and support.

Which should you buy?

Ultimately, choosing between the be quiet! Straight Power 12-1500w Modular Power Supply and the Seasonic CORE GX 650W Power Supply hinges on your specific needs. If you require a high-output, highly efficient power supply for a top-tier gaming rig or demanding workstation, the be quiet! model is worth the investment, despite its higher price tag of $254.99. However, for budget-conscious users or those building mid-range systems, the Seasonic CORE GX at $99.99 offers excellent value without compromising essential features. Depending on your requirements, each option has its merits, making it essential to assess your priorities before making a purchase.