SFX Power Supplies: Top 7 Compact PSUs in the UK for 2026
Publié le jeudi 26 février 2026
SFX power supply units are compact power supplies specifically designed for small form factor builds, maximizing space efficiency without compromising on power delivery. Perfect for mini PC enthusiasts and compact gaming rigs, SFX units stand out in a market where performance, thermal control and size are crucial. In the UK, demand for mini PC builds and tidy workspace solutions has grown among tech enthusiasts, content creators and casual users, driving preference for PSUs that combine high efficiency, quiet cooling, modular cabling and reliable voltage regulation. Buyers in the UK often prioritise 80 Plus Gold or Platinum efficiency ratings, fully modular designs to simplify cable management in tight cases, and enough wattage headroom for modern GPUs and CPUs. Retail availability from UK vendors and strong manufacturer warranties also influence purchasing decisions, making brand reputation and local support important factors.
Les meilleurs choix
Corsair SF750 Platinum
The Corsair SF750 Platinum is a compact SFX power supply that stands out due to its high efficiency rating of Platinum, which ensures minimal energy waste and optimal power delivery. This PSU features a fully modular design, allowing for easy cable management and customization. It also includes a 120mm fan that operates silently during low loads, enhancing its appeal for quiet builds. With excellent build quality and reliable performance, it's an ideal choice for high-performance small form factor PCs.
Cooler Master V850 SFX Gold
The Cooler Master V850 SFX Gold is a highly efficient power supply with an 80 PLUS Gold certification, delivering reliable and stable power for your system. Its compact size allows for easy installation in smaller cases, making it a perfect choice for mini-ITX builds. The fully modular cables help to streamline cable management, ensuring a clean and organized setup. With options for smart fan technology, this PSU provides a great balance of performance and quiet operation.
SilverStone SX1000 Platinum
SilverStone SX1000 Platinum stands out as the highest-capacity, highest-efficiency SFX offering in this list, providing substantial headroom for power-hungry small-form-factor systems with an 80 Plus Platinum focus on reduced waste heat and operating cost. For the search topic "undefined" it claims the top spot by combining top-tier electrical performance and thermal management, though it is pricier and physically larger than the other models which target quieter, mid-range, or budget SFF needs.
Corsair SF1000L
Corsair SF1000L targets users who want a 1000W SFX solution that balances high output with a tuned acoustic profile and competitive pricing relative to the SilverStone flagship. For the search topic "undefined" it earns its position as a practical high-watt alternative—trading a bit of premium efficiency for lower acquisition cost and refined noise characteristics compared with the top-tier Platinum offering.
FSP Dagger Pro 850W
The FSP Dagger Pro 850W is a highly efficient and compact power supply, boasting an 80 PLUS Gold certification for maximum energy efficiency. Its small footprint makes it perfect for space-constrained PC builds while maintaining strong performance under high workloads. The fully modular cable design allows for quick and easy installation, which is ideal for users who prioritize aesthetics. With a focus on reliability and durability, this power supply caters to gamers and content creators alike.
Lian Li SP750
Lian Li SP750 occupies the mid-range sweet spot, offering 750W of compact power that balances efficiency, price, and size for the majority of small-form-factor builds. For the search topic "undefined" it is a strong choice when you want meaningful headroom without the cost or bulk of 1000W units, positioning itself between the high-end SilverStone and the budget-conscious Fractal in both technical capability and overall value.
Fractal Design Ion SFX 650G
Fractal Design Ion SFX 650G is the market leader for budget-conscious SFF builders, delivering 650W of dependable power with 80 Plus Gold efficiency at a typically lower price point than the other entries. For the search topic "undefined" it ranks as the best value and most efficient mainstream option—sacrificing ultimate headroom in exchange for lower cost, reduced heat output, and broad suitability for typical compact builds.
What research says about compact PSUs and why they work
Independent testing and industry research highlight how modern compact PSUs deliver comparable electrical performance to larger units while offering better space efficiency and lower system noise when designed well. Studies and standard test procedures measure efficiency, thermal performance and ripple, demonstrating that certified high-efficiency units reduce heat output and operating costs. Quality components and active thermal management improve reliability and lifespan, which is especially important in compact cases where heat density is higher.
Efficiency matters: 80 Plus Gold and Platinum certifications indicate lower energy waste and reduced heat generation, backed by standardized test procedures used across the industry.
Thermal performance: lab tests show that well-designed SFX PSUs with efficient airflow and good fan control run cooler under load than older compact models, which preserves internal components and reduces thermal throttling.
Component quality: research into capacitor types and build quality links higher-spec components to longer operational life and more stable voltage delivery under sustained loads.
Noise and acoustic control: measured noise profiles demonstrate that modern SFX units with intelligent fan curves provide a good balance of cooling and quiet operation for desktop and living-room builds.
Power density and safety: advances in power conversion allow higher wattage in smaller enclosures while meeting international safety and electromagnetic compatibility standards, enabling high-performance mini systems.
Questions régulièrement posées
Which SFX PSU should I buy for a mini-ITX build?
For mini-ITX builds, consider Cooler Master V850 SFX Gold: it’s an 850W SFX-L unit with 80 PLUS Gold efficiency, designed for reliable, stable power in smaller cases (rating 4.7).
Does Corsair SF750 Platinum support modular cable management?
Yes—Corsair SF750 Platinum is fully modular, so you can manage and customise cables, and it delivers 750W in an SFX form factor with a Platinum efficiency rating (rating 4.8).
How does the value compare between SF750 and SX1000?
Corsair SF750 Platinum and SilverStone SX1000 Platinum are both high-efficiency options, but SilverStone offers 1000W with 80 PLUS Platinum in an SFX-L form factor, while Corsair is 750W with Platinum in SFX (ratings 4.7 vs 4.8).
Is SilverStone SX1000 Platinum for high-TDP CPUs and multi-GPU?
Yes—SilverStone SX1000 Platinum is designed for sustained heavy loads, suitable for high-TDP CPUs and multi-GPU setups, using a 1000W SFX-L form factor with 80 PLUS Platinum efficiency (rating 4.7).
Conclusion
SFX power supplies are a practical choice for UK builders who want compact systems without sacrificing performance. The top options on this page — Corsair SF750 Platinum, Cooler Master V850 SFX Gold, SilverStone SX1000 Platinum, Corsair SF1000L, FSP Dagger Pro 850W, Lian Li SP750, and Fractal Design Ion SFX 650G — cover a range of wattages, efficiency levels and price points to suit different needs. For most high-end compact builds the SilverStone SX1000 Platinum stands out as the best overall choice thanks to its exceptional wattage capacity and Platinum efficiency in a compact format, while the Corsair SF750 Platinum and Cooler Master V850 SFX Gold are excellent choices where a balance of size, efficiency and cost matters. I hope you found what you were looking for — you can refine or expand your search using the site search to filter by wattage, efficiency, modularity or price.