For compact PC builds, a power supply that fits a small form factor without sacrificing performance is essential. SFX-L power supplies offer higher wattage in a compact footprint, making them ideal for powerful mini-ITX and small form factor (SFF) systems. Below are five top picks that align with ATX 3.0 compatibility, PCIe 5.0 readiness, and modular cabling for clean builds.
Summary Table Of Selected Products
| Product | Brand | Wattage | Key Features |
|---|---|---|---|
| CORSAIR SF850 (2025) | Corsair | 850W | 80 Plus Platinum, SFX, PCIe 5.0 Ready, ATX 3.0 |
| CORSAIR SF750 (2025) | Corsair | 750W | 80 Plus Platinum, SFX, PCIe 5.1 Ready, ATX 3.1 |
| ASUS ROG Loki SFX-L 850W Platinum | ASUS | 850W | 80+ Platinum, ATX 3.0, PCIe 5.0 Ready, ARGB |
| ASUS ROG Loki SFX-L 750W Platinum | ASUS | 750W | 80+ Platinum, ATX 3.0, PCIe 5.0 Ready, ARGB |
| Lian Li SP V2 750W SFX | Lian Li | 750W | ATX 3.1, PCIe 5.0, 92mm FDB fan |
CORSAIR SF850 (2025) – SFX-L Powerhouse
The Corsair SF850 (2025) is a high-widelity SFX-L power supply designed for compact builds that demand network-class stability. It delivers 850 watts with 80 Plus Platinum efficiency, minimizing heat and power waste in a tight space. Being ATX 3.0 compliant and PCIe 5.0 ready, it reduces transient spikes when GPUs draw peak power. The fully modular design uses Type-5 Micro-Fit connectors to simplify cable routing in small cases, helping maintain a clean interior and airflow. This model is a strong option for small form factor systems seeking premium efficiency and robust headroom.
CORSAIR SF750 (2025) – Compact Power with Platinum Efficiency
The Corsair SF750 (2025) is a slightly smaller sibling to the SF850, offering 750 watts of Platinum efficiency in the same SFX form factor. It meets ATX 3.1 standards and is PCIe 5.1 ready, designed to handle the power demands of mid-range GPUs while keeping heat and fan noise down. Its fully modular interface uses compact cables that minimize clutter in tight chassis. This model suits compact builds that require steady performance with less space allocated to power cabling.
ASUS ROG Loki SFX-L 850W Platinum
The ASUS ROG Loki SFX-L 850W Platinum expands high-performance capability into a compact footprint with a 120mm PWM ARGB cooling solution. ROG heatsinks cover critical components to minimize temps and extend lifespan, while ATX 3.0 compatibility and a bundled 16-pin PCIe cable support up to 600 watts to PCIe Gen 5.0 GPUs. The unit’s Lambda A certification and ARGB features align with premium gaming builds that demand both performance and aesthetics.
ASUS ROG Loki SFX-L 750W Platinum
The 750W variant from ASUS delivers the same rugged build quality and cooling efficiency as its larger sibling, with 80 Plus Platinum efficiency and ATX 3.0 compliance. The SFX-L form factor supports PCIe 5.0, enabling robust power delivery for mid-to-high-end GPUs while maintaining quiet operation through its PWM-controlled fan and optimized heatsinks. This is a practical choice for users prioritizing compact size without compromising power headroom.
Lian Li SP V2 750W SFX – Clean, Quiet, Efficient
The Lian Li SP V2 750W SFX is a modular, high-efficiency power supply designed for ATX 3.1 and PCIe 5.0 readiness. It features a reliable 92mm FDB fan for steady cooling and an all-around emphasis on cable management, which is crucial in compact builds. The SP V2 integrates neatly with SFF cases seeking a quiet yet capable power source for compact gaming or content creation systems.
Buying Guide: Key Considerations For SFX-L Power Supplies
- Wattage headroom: Choose a unit with enough power for your CPU and GPU combination, plus potential future upgrades. SFX-L models commonly range from 750W to 850W, with some options reaching higher for demanding builds.
- Efficiency and certification: Look for 80 Plus Platinum or Gold ratings to maximize efficiency, reduce heat, and lower operating costs in compact enclosures where cooling is more challenging.
- ATX 3.0 and PCIe 5.0 readiness: Ensure the PSU can handle transient spikes from modern GPUs and supports PCIe Gen 5 connectors when applicable.
- Modularity: Fully modular cabling simplifies routing in tight cases and improves airflow. Type-5 Micro-Fit and other compact connectors help minimize cable bulk.
- Cooling design: PWM-controlled fans and well-ventilated heatsinks reduce temperatures and noise. Some models include ARGB lighting for aesthetics in builds with themed lighting.
- Physical form factor: SFX-L provides higher wattage than standard SFX in a similar footprint. Confirm compatibility with your case’s PSU shroud, space, and mounting points.
- Warranty and reliability: Look for 7–10 year warranties and reputable brand support to ensure long-term reliability in compact systems where maintenance may be more involved.
- Cable length and accessibility: In limited spaces, shorter cables reduce clutter. Check if the set includes 8- or 16-pin PCIe adapters and whether cables are directional and velvet-curled for neat routing.
The choices listed above represent a range of high-efficiency, compact power supplies designed to support modern GPUs and compute workloads in small form factors. When selecting, consider the intended use case, chassis dimensions, and future expansion plans to balance wattage, efficiency, and cabling practicality.