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Choosing the right power supply is crucial for building a reliable and efficient small form factor PC. The year 2026 has introduced a variety of SFX power supplies that combine compact size with high performance. In this article, we review the top 120mm units designed for small builds, focusing on features, efficiency, and value.
What is an SFX Power Supply?
An SFX power supply is a compact PSU designed specifically for small form factor (SFF) PCs. Measuring approximately 125mm x 63.5mm x 100mm, these units save space inside tight cases while providing reliable power. They are ideal for mini-ITX builds, HTPCs, and compact gaming rigs.
Key Features to Consider in 2026
- Wattage: Ensure the PSU provides enough power for your components, typically 450W to 650W for most SFF builds.
- Efficiency: Look for units with 80 PLUS Gold or higher certification for better energy savings and lower heat output.
- Modularity: Fully modular PSUs help with cable management in tight spaces.
- Build Quality: Durable components and reliable protections are essential for longevity.
- Connectivity: Adequate PCIe, SATA, and Molex connectors for your hardware.
Top 120mm SFX Power Supplies of 2026
1. SilverStone SX650 Gold
The SilverStone SX650 Gold offers 650W of power with 80 PLUS Gold certification. Its fully modular design simplifies cable management, and its compact size fits perfectly in small cases. It features high-quality components and comprehensive protections, making it a top choice for demanding SFF builds.
2. Corsair SF750 Platinum
With 750W capacity and 80 PLUS Platinum efficiency, the Corsair SF750 is ideal for high-performance gaming and workstation builds. Its fully modular cables and compact design make installation straightforward, while its premium components ensure durability and stability.
3. Fractal Design Ion SFX 650W
The Fractal Design Ion SFX 650W provides reliable power with 80 PLUS Gold certification. Its compact size and quiet operation are perfect for silent or near-silent SFF builds. It includes a full suite of protections and high-quality capacitors for long-term dependability.
Choosing the Right Power Supply
When selecting an SFX power supply in 2026, consider your system’s power requirements, case compatibility, and future upgrade plans. Prioritize efficiency ratings and build quality to ensure your system runs smoothly and reliably over time.
Conclusion
The year 2026 offers a range of high-quality, compact SFX power supplies suitable for small form factor PCs. Whether you need a budget-friendly 450W unit or a high-capacity 750W model, the options listed above provide excellent performance, efficiency, and reliability for your next SFF build.