ASUS

ASUS ROG Loki SFX-L 850W Platinum

Expert rating8.8 / 10

Power SuppliesView on asus.com

Wattage:: 850 W
80 PLUS Rating:: Platinum
Modularity:: Fully Modular
ATX Standard:: ATX 3.1

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Manufacturer: ASUS Last updated: 2026-09-12

ASUS ROG Loki SFX-L 850W Platinum (850W/80+ Platinum/ATX 3.0/Popular High-End Gaming Tier) Review

ASUS ROG Loki SFX-L 850W Platinum 850W 80 Plus Platinum fully modular power supply, ATX 3.0 certified, SFX-L form factor, native 12V-2x6/12VHPWR connector, 10-year warranty, Seasonic platform.

The ASUS ROG Loki SFX-L 850W Platinum is ASUS's SFX-L flagship, aimed squarely at high-end Mini-ITX builds that need 850W of clean Platinum power without moving up to a full ATX chassis. Rated 850W at 80 PLUS Platinum (Cybenetics Platinum efficiency / A noise), it's built on a Seasonic platform with a 92mm dual ball bearing fan running a zero-RPM semi-passive mode at idle. Fully Modular cabling and a 130mm chassis depth make it a realistic fit for a small-form-factor build running a high-end GPU, and it's backed by a 10-year warranty.

Efficiency, Noise, and Build Quality

The ROG Loki SFX-L 850W Platinum carries an 80 PLUS Platinum certification and a Cybenetics Platinum efficiency / A noise rating, translating to consistently high real-world efficiency at typical 50% load and low fan noise thanks to its 92mm dual ball bearing, semi-passive. It uses a Seasonic platform with Japanese-made capacitors throughout for long-term reliability under sustained load.

Connectors and Cabling

Connector layout is 1x 24-pin ATX, 1x EPS 4+4, 1x 12V-2x6 (450W), 4x PCIe 6+2-pin, 6x SATA, 2x Molex. With 1 native 12V-2x6 connector(s) rated to deliver up to 600W to a single GPU, there's no need for a 4x8-pin-to-12VHPWR adapter on current-generation flagship cards. Cabling is fully modular, using standard flat or ribbon cables, with a single +12V rail design that simplifies load balancing across connectors.

Comparison to Alternatives

Against the MSI MAG Ai1600TS PCIE5 (MSI's 1600W Titanium workstation flagship), the ASUS ROG Loki SFX-L 850W Platinum matches its wattage class but differs on connector generation and OEM platform, making the choice mostly about brand ecosystem, warranty length (10 years here), and whether native 12V-2x6 connectors matter for your GPU. Compared with the Corsair RM850x (Corsair's ATX 3.1 850W Gold mainstay), the ROG Loki SFX-L 850W Platinum sits in the popular high-end gaming bracket at 850W, so the decision usually comes down to matching wattage headroom to your actual GPU/CPU combo rather than one being categorically better.

Specifications

Identity

Brand	ASUS
Model Number	ROG Loki SFX-L 850W Platinum
Model Number	ROG-LOKI-850P-SFX-L-GAMING

Output and rails

+12V Rail Amperage	70.8 A
Single +12V Rail	Yes

Standards and compliance

Hold-Up Time	20.8 ms

Efficiency and noise

Measured Avg Efficiency	90.31 %
Measured Average Noise	23.76 dBA

Connector inventory

EPS 8-pin Connectors	2
SATA Connectors	6
Molex Connectors	4

Form factor and fit

Length	125 mm
Colour	Black
RGB Lighting	Yes

Cooling

Fan Bearing	Ball

Build quality

MTBF	120000 hours

Cables

Modularity	Fully Modular

Monitoring, protection and price

Protections	OPP, OVP, UVP, SCP, OCP, OTP
Price	219.99 USD
Warranty	10 years

Wattage	850 W
80 PLUS Rating	Platinum
ATX Standard	ATX 3.1
Form Factor	SFX-L
Cybenetics Efficiency	Platinum
Cybenetics Noise	A
12V-2x6 Connectors	1
Zero-RPM Mode	Yes
Sleeved Cables	No
PCIe 8-pin Connectors	3
Connector Count	1x 24/20-pin ATX, 2x EPS 4+4-pin, 1x PCIe 16-pin, 3x PCIe 8-pin, 6x SATA, 4x Peripheral
Fan Size	120 mm
Fan Model / Bearing	120mm double ball bearing (CF1225H12D)
OEM / Platform	Great Wall
Japanese Capacitors	Yes
Cable Lengths	ATX 450mm, EPS 550mm, 16-pin 460mm, PCIe 450mm, SATA 300+190+90mm, Molex 300+100+100+100mm
Source URL	https://rog.asus.com/power-supply-units/rog-loki/rog-loki-850p-sfx-l-gaming-model/spec/

Expert Review

Reviewed by Burooj Alam. Rated by us, not by users.

Expert rating8.8 / 10

A best-in-class 850W Platinum-rated SFX-L unit for a small-form-factor build running a high-end GPU, held back only by its premium price.

Best for

Builders targeting a small-form-factor build running a high-end GPU
Anyone who wants fully modular cabling with native 12V-2x6 support
Systems where a 10-year warranty and Platinum-tier efficiency matter

Not for

Builds needing more than 850W of continuous headroom
Buyers who need a full-size ATX chassis
Cost-sensitive builds better served by a lower-tier 80+ Bronze unit

FAQs

What are the key specifications of the ASUS ROG Loki SFX-L 850W Platinum (850W/80+ Platinum/ATX 3.0/Popular High-End Gaming Tier)?

The ASUS ROG Loki SFX-L 850W Platinum (850W/80+ Platinum/ATX 3.0/Popular High-End Gaming Tier) is a power supply from ASUS. Key specs: Wattage 850 W, 80 PLUS Rating Platinum, Cybenetics Efficiency Platinum, Cybenetics Noise A, Modularity Fully Modular.

Will the ASUS ROG Loki SFX-L 850W Platinum (850W/80+ Platinum/ATX 3.0/Popular High-End Gaming Tier) work with my current setup?

The ASUS ROG Loki SFX-L 850W Platinum (850W/80+ Platinum/ATX 3.0/Popular High-End Gaming Tier) lists Wattage is 850 W. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.

Who is the ASUS ROG Loki SFX-L 850W Platinum (850W/80+ Platinum/ATX 3.0/Popular High-End Gaming Tier) best suited to?

It suits builders targeting a small-form-factor build running a high-end gpu, anyone who wants fully modular cabling with native 12v-2x6 support, systems where a 10-year warranty and platinum-tier efficiency matter.

What are the drawbacks of the ASUS ROG Loki SFX-L 850W Platinum (850W/80+ Platinum/ATX 3.0/Popular High-End Gaming Tier)?

It is a poor fit for builds needing more than 850w of continuous headroom, buyers who need a full-size atx chassis, cost-sensitive builds better served by a lower-tier 80+ bronze unit.