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be quiet! Straight Power 12-1500w Modular Power vs Seasonic Focus GX 850W Power Supply ATX 3.1 PCIe

Updated August 2026 — be quiet! Straight Power 12-1500w Modular Power wins on power and efficiency, Seasonic Focus GX 850W Power Supply ATX 3.1 PCIe wins on price.

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

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

Power Output

1500W vs 850W

Efficiency

80 PLUS Platinum vs Gold

Cooling

Silent Wings fan vs FDB fan

Why Seasonic Focus GX 850W Power Supply ATX 3.1 PCIe is better

Price

$139.99 vs $254.99

Warranty

Both have 10 years

Compactness

Smaller wattage for less space

Overall score

be quiet! Straight Power 12-1500w Modular Power
90
Seasonic Focus GX 850W Power Supply ATX 3.1 PCIe
75

Specifications

Specbe quiet! Straight Power 12-1500w Modular PowerSeasonic Focus GX 850W Power Supply ATX 3.1 PCIe
Wattage1500W850W
Efficiency Rating80 PLUS Platinum80 PLUS Gold
Fan TypeSilent Wings 135mm135mm FDB
PCIe SupportPCIe 5.0PCIe 5.1
CapacitorsJapanese 105°CStandard

Dimension comparison

be quiet! Straight Power 12-1500w Modular PowerSeasonic Focus GX 850W Power Supply ATX 3.1 PCIe

Overview of Power Supply Units

When it comes to power supplies, two standout options are the be quiet! Straight Power 12-1500w Modular Power Supply and the Seasonic Focus GX 850W Power Supply. The former offers a robust 1500W of continuous power, while the latter provides a solid 850W. This difference in wattage indicates that the be quiet! model is designed for high-end systems that demand more power, making it particularly appealing for users with multiple graphics cards or demanding processors.

Efficiency Ratings

The be quiet! Straight Power 12 boasts an impressive 80 PLUS Platinum certification, achieving energy efficiency rates of up to 93.9%. This high efficiency not only translates to lower electricity bills but also ensures cooler operation. In contrast, the Seasonic Focus GX is 80 PLUS Gold certified, which, while still efficient, doesn't quite match the Platinum level of the be quiet! unit. The difference in efficiency ratings could influence long-term operational costs, as the be quiet! power supply may save more energy over time.

Connectivity Options

The connectivity options are crucial for compatibility with modern components. The be quiet! Straight Power 12 features native support for PCIe 5.0 with its 12VHPWR connector and includes four PCIe 6+2-pin connectors for current-generation GPUs. This level of versatility makes it an excellent choice for gamers and content creators who plan to use high-performance graphics cards. Meanwhile, the Seasonic Focus GX offers a native 12V-2x6 connector, supporting PCIe 5.1, which is sufficient for many users but may limit future expansion compared to the be quiet! model.

Cooling Solutions

Cooling is a vital aspect of any power supply, and both models excel in this area, albeit with different designs. The be quiet! Straight Power 12 features a Silent Wings 135mm fan, designed for optimal airflow while minimizing noise. The unique fan blade design and advanced fluid-dynamic bearing contribute to quiet operation. The Seasonic Focus GX, on the other hand, uses a 135 mm FDB fan with hybrid fan control. While it also prioritizes quiet operation, the design specifically emphasizes a balance between acoustic performance and cooling efficiency. Both fans are effective, but be quiet! may have the edge in terms of silent operation.

Build Quality and Components

Build quality is a significant consideration when selecting a power supply. The be quiet! Straight Power 12 uses high-quality Japanese 105°C capacitors, ensuring stability and reliability, especially under load. This attention to component quality contributes to its longevity and performance. The Seasonic Focus GX also emphasizes high build quality, featuring the OptiSink Design, which enhances thermal performance and reliability. While both models utilize premium components, the be quiet! unit's focus on Japanese capacitors may provide an additional layer of assurance for users seeking maximum durability.

Warranty and Support

Warranty length can be an indicator of a manufacturer's confidence in their product. The be quiet! Straight Power 12 comes with a substantial 10-year warranty, reflecting the brand's commitment to quality and durability. Similarly, the Seasonic Focus GX also offers a 10-year warranty, providing peace of mind for consumers. Both warranties are excellent, but the substantial assurance from both brands indicates a strong backing for their respective products.

Price Comparison

Price can often sway the decision between two high-quality products. The be quiet! Straight Power 12 is currently priced at $254.99, while the Seasonic Focus GX is significantly cheaper at $139.99. This pricing represents a difference of about 45%, making the Seasonic model a more budget-friendly choice. For users who do not require the immense power output of the be quiet! model, the Seasonic Focus GX offers substantial savings without sacrificing essential features.

Which should you buy?

Ultimately, the decision between the be quiet! Straight Power 12 and the Seasonic Focus GX comes down to your specific needs. If you require high wattage for demanding systems and prioritize top-tier efficiency and cooling, the be quiet! Straight Power 12 is the optimal choice. However, if you are looking for a reliable, cost-effective power supply for a mid-range setup, the Seasonic Focus GX provides excellent performance at a significantly lower price point. For most users, balancing performance needs with budget constraints will guide the final decision.