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Compact SFX-L power supply unit with matte black casing, modular cable ports and a 120 mm axial-tech cooling fan visible on one side

ASUS

ASUS ROG Loki 850W SFX-L Platinum power supply

SKU CH-BBJB-Q8573

An 850 W SFX-L Platinum power supply with a 120 mm PWM fan, ATX 3.0 support and a 16-pin PCIe 5.0 cable delivering 600 W, Lambda A certified below 25 dB and 92 % efficiency

  • Max wattage850 W
  • Product typeSFX
  • 850 W output powers demanding compact builds
  • SFX-L form factor fits small cases
  • 80 PLUS Platinum 92 % efficiency cuts heat
  • ATX 3.0 ready with 600 W PCIe 5.0 cable
  • Lambda A certified under 25 dB quiet operation

850W SFX-L Platinum power supply

This ASUS ROG Loki unit delivers 850W from an SFX-L form factor with full modular cabling. It carries 80 PLUS Platinum certification for up to 92% efficiency and meets ATX 3.0 guidelines. A 16-pin PCIe cable can supply up to 600W to PCIe Gen 5.0 graphics cards. The condition is new.

Small-form-factor builders needing ATX 3.0 power

The SFX-L size fits compact cases that accept this standard while the 850W ceiling covers high-end single-GPU systems. Builders whose cases only accept the smaller SFX form factor cannot use this unit. Systems requiring more than 850W or multiple 16-pin connectors should look at larger form-factor supplies.

850W headroom with Platinum efficiency

The 850W rating comfortably handles a modern CPU paired with a PCIe Gen 5.0 graphics card drawing up to 600W through the 16-pin cable. Platinum efficiency keeps waste heat and fan noise low, with Lambda A certification confirming noise below 25dB. The 120mm PWM fan spins only when thermal load demands it. Sustained loads beyond 850W exceed the unit's capacity.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $156.99
Typical for this category: the median of 10,869 items is $142.99.
Max wattage 850 W
Typical for this category: the median of 930 items is 850 W.

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Specifications

Product
Brand nameASUS
Part numberROG-LOKI-850P-SFX-L-GAMING
Product typeSFX
Power
Max wattage850 W

Questions about this item

What ATX 3.0 16-pin PCIe cable does the 850W Loki include for a PCIe 5.0 graphics card?

It ships with a 16-pin cable that can deliver up to 600 W to a PCIe 5.0 GPU, meeting ATX 3.0 requirements.

Will the 120 mm axial-tech fan stay quiet next to older components in a tight SFX build?

Lambda A certification confirms noise below 25 dB, and the PWM fan ramps only when thermals demand it.

How can I verify the Platinum efficiency is actually reaching 92 % after installation?

Monitor input versus output power under load; 80 PLUS Platinum guarantees up to 92 % efficiency at typical loads.

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