ASUS ROG Loki SFX-L 850W Platinum

PSU Tier A • ASUS • $ 253.65

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The ASUS ROG Loki SFX-L 850W Platinum is a premium power supply designed for enthusiasts who demand top-tier performance in compact builds. With its SFX-L form factor, it fits perfectly in small form factor (SFF) cases while delivering the power and reliability of a full-sized ATX unit. Certified 80 PLUS Platinum, it achieves up to 94% efficiency at 230V, reducing heat and energy waste.

Key Features

ATX 3.0 & PCIe 5.0 Ready: Includes a native 16-pin 12VHPWR connector for next-gen GPUs, ensuring stable power delivery.
0dB Technology: The 120mm Axial-tech fan stays completely silent under low loads, perfect for quiet builds.
Fully Modular Design: All cables are detachable, allowing clean cable management and improved airflow.
Single +12V Rail: Provides 850W continuous power, ideal for high-end CPUs and GPUs.
Comprehensive Protections: OVP, UVP, OPP, OCP, OTP, and SCP safeguard your components.

Performance and Efficiency

With 80 PLUS Platinum certification, the Loki delivers exceptional efficiency, translating to lower electricity bills and cooler operation. The single +12V rail ensures stable power even under heavy transient loads. The 120mm dual ball bearing fan offers long life and quiet operation, while the semi-fanless mode keeps it silent during everyday tasks.

Who Is It For?

This PSU is ideal for PC builders creating compact gaming rigs, HTPCs, or workstation systems that require high power in a small footprint. It's also perfect for those using the latest RTX 40-series or RX 7000-series GPUs with 12VHPWR connectors.

Use Cases

Small form factor gaming PCs
High-end builds with power-hungry GPUs
Quiet home theater PCs
Professional workstations in compact cases

Backed by ASUS's renowned quality and a 10-year warranty, the ROG Loki SFX-L 850W Platinum is a smart investment for any premium SFF build.

Key Specifications

Connector Type: ATX12V / EPS12V (fully modular)

Output Wattage: 850 Watts continuous (single +12 V rail)

Form Factor: SFX-L (125 × 125 × 63.5 mm)

Wattage: 850 W

Cooling Method: Air‑cooled, 120 mm Dual Ball Bearing Axial-tech fan with 0dB Technology (semi-fanless / silent mode)

Design: Full Modular

Protections: OVP, UVP, OPP, OCP, OTP, SCP

Efficiency: 80 PLUS Platinum certified (≈ 92 % @115 VAC / ≈ 94 % @230 VAC)

Cable Set: 1X 24‑pin ATX motherboard 2X 8‑pin EPS12V (4+4) CPU connector 3X 6+2‑pin PCIe 1X 16‑pin (12VHPWR) PCIe 5.0 6X SATA 4X Four‑Pin Peripheral (Molex)

Detailed Parameters

Rated Power Output in Watts:: 850
Form Factor:: SFX-L

Where to Buy

Amazon

Pros

80+ Platinum efficiency for lower power consumption
Native 12VHPWR connector for PCIe 5.0 GPUs
0dB fan mode for silent operation under low loads
Compact SFX-L size fits most SFF cases
Fully modular cables for clean builds

Cons

Premium price compared to ATX PSUs
SFX-L may not fit in very small cases (requires SFX-L support)
Cable length might be short for large cases

Frequently Asked Questions

Is the ASUS ROG Loki SFX-L 850W Platinum compatible with ATX cases?

Yes, it can be used in ATX cases if the case has mounting holes for SFX-L or an adapter bracket. However, it is primarily designed for small form factor cases.

Does this PSU support the RTX 4090?

Yes, it includes a native 12VHPWR connector and is ATX 3.0 compliant, making it fully compatible with RTX 4090 and other high-end GPUs.

What is the warranty period for the ROG Loki SFX-L 850W Platinum?

ASUS provides a 10-year warranty for this power supply, covering defects and failures under normal use.

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