Small form factor (SFF) PCs have become increasingly popular in recent years, thanks to their compact size, portability, and low power consumption. However, building an SFF PC can be challenging, as most standard power supply units (PSUs) are too large to fit into the small cases of SFF systems. As a result, choosing the right PSU is critical to ensure compatibility, performance, and stability. In this article, we will explore some of the best PSU options for SFF PCs.

What to Consider When Choosing an SFF PSU

Before diving into our top picks, let's review some essential factors to consider when selecting an SFF PSU:

  1. Form Factor: SFF systems require PSUs with a small form factor to fit inside their cases. The most common SFF PSU form factors are SFX and Flex ATX, which have dimensions of 125 x 63.5 x 100 mm and 150 x 81.5 x 40.5 mm, respectively.

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  2. Wattage: The wattage of the PSU should match or exceed the power requirements of your SFF PC components. A PSU with insufficient wattage can cause instability, while an overpowered PSU may waste energy and generate unnecessary heat.

  3. Efficiency: An efficient PSU can save energy, reduce heat output, and prolong the lifespan of your components. Look for PSUs with at least 80 Plus Bronze certification, which ensures a minimum efficiency of 82-85% at 20-100% load.

  4. Modularity: Modular PSUs allow you to connect only the cables you need and reduce cable clutter inside the case. This can improve airflow, aesthetics, and ease of installation.

Top Picks for SFF PSUs

  1. Corsair SF Series: The Corsair SF Series is one of the most popular SFF PSU choices, thanks to its high-quality components, compact size, and excellent performance. Available in 450W, 600W, and 750W variants, these PSUs have a fully modular design, 80 Plus Gold certification, and a quiet fan for efficient cooling.

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  2. SilverStone SX Series: The SilverStone SX Series is another top contender for SFF PSUs, offering a range of wattage options from 450W to 800W. These PSUs feature an SFX-L form factor, which is slightly longer than SFX but offers higher power output and improved compatibility with larger cases. The SX Series also has 80 Plus Gold certification, a semi-modular design, and a silent fan.

  3. FSP Dagger Pro Series: The FSP Dagger Pro Series is a relatively new entrant to the SFF PSU market, but it has received positive reviews for its innovative design and high efficiency. These PSUs come in 500W and 600W versions, with an ultra-compact Flex ATX form factor that measures only 150 x 40.5 x 81.5 mm. The Dagger Pro Series has 80 Plus Platinum certification, a fully modular design, and a low-noise fan.

  4. Seasonic Focus SGX Series: The Seasonic Focus SGX Series is a reliable and affordable option for SFF PSUs, with a 650W model that uses an SFX-L form factor and 80 Plus Gold certification. This PSU features a semi-modular design, a hybrid fan control system for quiet operation, and high-quality Japanese capacitors for long-lasting performance.

  5. Cooler Master V SFX Series: The Cooler Master V SFX Series is a compact and powerful PSU option, with a 650W model that uses an SFX form factor and 80 Plus Gold certification. This PSU features a fully modular design, flat cables for easy routing and management, and a quiet fan with a custom heat sink for efficient cooling.

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Conclusion

Choosing the right PSU for an SFF PC can be a daunting task, but it's crucial to ensure compatibility, performance, and stability. The Corsair SF Series, SilverStone SX Series, FSP Dagger Pro Series, Seasonic Focus SGX Series, and Cooler Master V SFX Series are some of the best PSU options for SFF systems, offering various wattage levels, form factors, efficiency ratings, and modularity features. When selecting an SFF PSU, make sure to consider your specific system requirements and budget, as well as the factors we discussed in this article.

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