Excellent balance between price and performance.
Offers reliable performance at a good value for money.
Designed for users demanding high performance and energy efficiency.
👍 What we like
- ✓High energy efficiency: 80 Plus Platinum (Corsair) or Gold (be quiet!, Seasonic).
- ✓Compact SFX (Corsair) or SFX-L (Seasonic) form factor; the be quiet! is ATX.
- ✓Low noise level: fan stops at low load on the Corsair and Seasonic models.
- ✓Wide range of connectors available for maximum flexibility.
👎 What to watch
- ✕Generally more expensive than standard power supplies.
- ✕Fewer PCI-E connectors compared to larger form factors.
- ✕Availability may vary by region and supplier.
- ✕Some models may have limitations in terms of supporting multiple hard drives simultaneously.
🏆 Our picks
Affiliate links · same price for yoube quiet! Pure Power 12 M 550W
Amazon · price and availability on the listing
Seasonic Focus SGX-650
Amazon · price and availability on the listing
See all our recommended gear in the shop.
📑 Contents ▾
In 2026, home lab systems and DIY NAS continue to grow, requiring compact yet powerful power solutions. The increasing adoption of SFX (Small Form Factor) power supplies reflects the need for smaller equipment while maintaining high performance and energy efficiency. In this guide, we explore the best options available for 2026, highlighting their specific advantages and disadvantages for compact server or DIY NAS applications.
Why this choice matters
The power supply is a critical component in any computer system as it ensures stable power delivery to all components. In the context of home lab systems and NAS, the reduced size of enclosures often imposes constraints on available space, making SFX power supplies particularly suitable. These power supplies offer not only a compact form factor but also improved energy efficiency due to modern design.
The 80 Plus Platinum certification has become the standard for users demanding high performance and efficiency. It guarantees that the power supply achieves at least 92% efficiency at 50% load (115V threshold), significantly reducing overall system electricity consumption. Additionally, fans that stay off at low load (Corsair, Seasonic) prevent disruptive noises in a home environment.
Finally, the growing importance of SFX power supplies for 2026 lies in their adaptation to new technologies and system configurations. For instance, the ability to provide stable power to multiple hard drives simultaneously is crucial for high-speed NAS systems.
Buying criteria
To evaluate these SFX power supplies for use in a compact server or DIY NAS, we focused on nominal power output, 80 Plus certification and number of available PCI-E connectors. Nominal power must be sufficient to support necessary components without overheating, while 80 Plus certification ensures high energy efficiency.
An adequate number of PCI-E connectors is also crucial for supporting a graphics card or a power-hungry expansion card (SSDs are powered through the M.2 slot or SATA connectors). Furthermore, the SFX form factor needs to fit within the space available in your enclosure with specific considerations regarding airflow and cooling.
We did not test these products ourselves: the figures on this page are indicative orders of magnitude that we have not verified; refer to the manufacturers’ spec sheets. The final score takes into account value for money, energy efficiency, and long-term reliability.
Presentation of the 3 recommended products
1. Corsair SF450 Platinum
The Corsair SF450 Platinum is an ideal choice for a high-performance SFX power supply in 2026, offering a nominal output of 450W with 80 Plus Platinum certification. Its two 6+2-pin PCI-E connectors can power a graphics card while maintaining a compact design. Its 92mm fan stays off at low and medium loads (Zero RPM mode) for near-silent operation.
2. be quiet! Pure Power 12 M 550W
The be quiet! Pure Power 12 M 550W provides 550W with an 80 Plus Gold certification. Note: it is an ATX unit, not SFX, so it will not fit a case that only accepts SFX. It is a great balance between performance and cost for an ATX-compatible case. Its silent design is perfect for home environments, while its compatibility with various connectors ensures significant usage flexibility.
3. Seasonic Focus SGX-650
The Seasonic Focus SGX-650 reigns supreme among SFX power supplies in 2026 for those seeking superior performance, offering a nominal output of 650W and 80 Plus Gold certification, in the SFX-L form factor (125 x 125 x 63.5 mm). It features a 120mm fan with a fanless mode at low load and four 6+2-pin PCI-E connectors, ideal for high-speed systems.
Comparison table
| Product | Corsair SF450 Platinum | be quiet! Pure Power 12 M 550W | Seasonic Focus SGX-650 |
|---|---|---|---|
| Power (W) | 450 | 550 | 650 |
| Certification | Platinum | Gold | Gold |
| PCI-E Connectors | 2 | see spec sheet | 4 |
Estimated prices may vary by region.
Use cases
The Corsair SF450 Platinum is ideal for those seeking a good balance between performance and budget. With its 450W power output, it perfectly suits systems with low to moderate component configurations.
The be quiet! Pure Power 12 M 550W is recommended for users concerned about noise levels and value for money. Its Gold certification offers an ideal compromise between performance and cost.
The Seasonic Focus SGX-650 is the perfect solution for high-speed systems requiring a high-capacity power supply with exceptional performance.
Pitfalls to avoid
One common pitfall to avoid when choosing an SFX power supply is purchasing excessive wattage, which can lead to unnecessary costs without significant performance improvement. Additionally, it’s important to verify that you have enough PCI-E connectors for your configuration.
It’s also crucial to consider the product’s availability in your region and space constraints within the enclosure where you plan to integrate it.
Verdict
In conclusion, our top pick is the Corsair SF450 Platinum for its excellent value, although the Seasonic Focus SGX-650 offers exceptional performance for those seeking the best on the market. We recommend using our recommended hardware guides to complete your home lab or DIY NAS setup.
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