Best Power Supplies for ITX Cases: Top SFX PSUs for Small Form Factor PCs
Power efficiency and compact design are essential for ITX builds. This guide highlights five compact, reliable power supplies suited for small form factor cases, including SFX and flex-ATX options. Each unit is evaluated for cooling, modularity, connector availability, and protection features to help you balance performance with space constraints.
| Product | Brand | Power (W) | Type | Modular |
|---|---|---|---|---|
| Apevia ITX-PFC500W | Apevia | 500 | Mini ITX / Flex ATX | Fully modular |
| Cooler Master V850 SFX Gold | Cooler Master | 850 | SFX Gold | Modular |
| Cooler Master V750 SFX Gold | Cooler Master | 750 | SFX Gold | Modular |
| Apevia SFX-AP500W | Apevia | 500 | SFX / Micro ATX | Modular |
| Thermaltake Smart 500W | Thermaltake | 500 | ATX | Non-modular |
Apevia ITX-PFC500W: Flexible 500W Mini ITX PSU
Apevia ITX-PFC500W is a fully modular 500W power supply designed for Mini ITX and FLEX ATX builds. It features full-range active PFC (90-264V) for efficient operation across regions and a protective suite including overvoltage, overcurrent, and short-circuit protections. The unit uses a 40mm cooling fan and provides a main 20+4 pin, 8-pin 12V, PCIe, SATA, and Molex connectors, suitable for compact desktop or small server deployments. This PSU is well-suited to ITX cases requiring flexible cable management and reliable performance in tight spaces.
Cooler Master V850 SFX Gold: 850W ITX Power with ATX 3.1
The V850 SFX Gold is a flagship ITX PSU that emphasizes compact form without sacrificing power. It includes a 90° PCIe 5.1 connector and ATX 3.1 cables, supporting high-demand GPUs with up to 600W to the GPU, while delivering reliable efficiency. Its SFX design is ideal for sealed mini-ITX builds and small workstations, with durable cabling and a 10-year warranty. The unit balances compact size with robust 850W output, making it suitable for premium small form factor gaming rigs and compact creative systems.
Cooler Master V750 SFX Gold: 750W For Mini-ITX
The V750 SFX Gold delivers high performance in a compact SFX form factor, making it ideal for mini-ITX builds that demand power for gaming or content creation. It includes 90° cables with a 12VHPWR PCIe 5.1 connector and ATX 3.1 support, enabling safer, more durable connections to modern GPUs. The PSU provides strong efficiency with 80 Plus Gold certification and comes with a 10-year warranty, appealing to users seeking long-term reliability in space-saving enclosures.
Apevia SFX-AP500W: SFX 500W Modular Power
Apevia SFX-AP500W is a modular 500W SFX power supply designed for Micro ATX and SFX builds. It provides essential connectors including 20+4 main power, 8-pin 12V, PCIe, SATA, and Molex, with a compact 125mm x 100mm x 63.5mm footprint. This unit is a practical choice for users who need a compact, reliable power source for small desktops or POS systems in ITX enclosures, offering straightforward modularity to simplify cable routing.
Thermaltake Smart 500W: Budget ITX Power
The Thermaltake Smart 500W is a budget-friendly option offering continuous 500W output with 80 Plus certification. It adheres to ATX 12V standards with active PFC and is suitable for standard ITX builds that do not require modular cables. While not a premium option, it provides dependable performance for basic small form factor desktops, multimedia PCs, or compact workstation setups that prioritize value and straightforward installation.
Buying Guide: Key Considerations For ITX Power Supplies
When selecting a power supply for an ITX case, several factors influence compatibility and longevity. Consider the following perspectives to choose the right unit for your system:
- Form factor: SFX and Flex-ATX dominate ITX builds due to compact dimensions. Confirm your case supports the PSU’s size and mounting points before purchasing.
- Power headroom: High-end GPUs or CPUs require more wattage. For gaming or content work in a small form factor, aim for 650W or more if you plan to pair with a power-hungry GPU, otherwise 500W-650W often suffices for mid-range builds.
- Efficiency and certifications: 80 Plus Gold or higher reduces electricity use and heat. It contributes to quieter operation and longer component life in compact spaces.
- Modularity: Fully modular cables simplify cable management in tight cases, improving airflow and aesthetics. Partial modularity can still reduce clutter.
- Cabling and connectors: Ensure you have sufficient PCIe, SATA, and CPU power connectors for your components, especially with modern GPUs that may require PCIe 5.1 12VHPWR connectors.
- Cooling and noise: Small PSUs must dissipate heat efficiently. Look for units with quality fan bearings and low-noise operation at load to maintain a quiet build.
- Protection features: OVP, OCP, SCP, OTP, and short-circuit protection guard against electrical faults. This is especially important in compact builds where airflow is limited.
- Warranty and support: A longer warranty (often 5–10 years) provides peace of mind for a component with a long lifespan in a continuously powered system.
Comparative Perspectives
For compact builds, SFX designs like the Cooler Master V850 and V750 SFX Gold excel in cooling efficiency and cable management, while modularity helps reduce clutter in tight enclosures. Budget-focused options, such as Thermaltake Smart 500W, prioritize value but may lack modular cables or high-efficiency certification. Brands like Apevia offer compact, flexible solutions for POS or small server-like workloads, but potential buyers should review protection features and warranty terms closely. Always verify compatibility with your case, GPU length, and motherboard layout before purchase.