ASUS ROG LOKI SFX-L 850W Platinum PSU - ATX 3.1, PCIe 5.1
ASUS ROG
ASUS ROG LOKI SFX-L 850W Platinum PSU - ATX 3.1, PCIe 5.1
The ASUS ROG LOKI SFX-L 850W Platinum PSU is a compact, high-efficiency power supply built for small-form-factor gaming and workstation builds that demand next-generation GPU support. It delivers 850W of 80 PLUS Platinum-certified power in a 125 × 125 × 63.5 mm envelope, with ATX 3.1 and PCIe 5.1 readiness to support modern high-power graphics cards.
Why this product
ATX 3.1 and PCIe 5.1 ready
Includes a 16-pin cable rated to deliver up to 600W to PCIe Gen 5.1 graphics cards, with upgraded high-performance copper pins that reduce connector temperatures by 29°C for stability under load.
SFX-L compact form factor
At 125 × 125 × 63.5 mm and 1.815 kg, it fits tight SFF chassis while delivering full 850W capacity without compromise.
80 PLUS Platinum efficiency
Achieves up to 92% efficiency with Cybenetics Platinum certification on both 230V and 115V inputs, reducing heat and noise while improving reliability.
0dB silent mode
PWM-controlled 120 mm fan shuts off entirely when load is 40% or below, and Lambda A Certification guarantees noise below 25 dB under full operation.
Dual ball bearing fan
Fan rated for 80,000 hours of operation—twice the lifespan of sleeve bearings and longer than fluid dynamic alternatives—with ROG heatsinks to extend thermal efficiency.
10-year core warranty
Core product operation covered for a decade; RGB LEDs covered for 3 years, reflecting ASUS confidence in long-term reliability.
- Form FactorSFX-L
- Total Output850W
- Efficiency Rating80 PLUS Platinum
- Dimensions125 × 125 × 63.5 mm
- Weight1.815 kg
- Warranty10-year (core); 3-year (RGB)
- Noise CertificationLambda A (below 25 dB)
- SKUASU-2566
- EAN4711081722557
- Fits ATX 3.1 and PCIe Gen 5.1 systems; includes 16-pin connector for high-power graphics cards rated up to 600W.
- Compatible with SFF and mini-ITX chassis that accept SFX-L form factor (125 × 125 × 63.5 mm). ATX to SFX adapter bracket included for standard ATX cases.
- Modular cable set includes motherboard 24/20-pin, dual CPU 4+4-pin, single PCIe 16-pin, three PCIe 8-pin, six SATA, and four peripheral connectors.
- ARGB lighting and Smart Mode (GPU temperature-reactive effects) require an ASUS or ROG Aura Sync-compatible motherboard and graphics card respectively. Without these, the fan defaults to rainbow lighting.
Best for
- Small-form-factor gaming and workstation builds where space is critical and thermal efficiency matters.
- Next-generation GPU systems requiring PCIe 5.1 support and high sustained power delivery with minimal thermal footprint.
- Builders prioritizing silent operation and low heat generation through high efficiency and 0dB fan shutdown.
- Long-term system owners expecting a decade of reliable service with dual ball bearing cooling and robust component design.
- Aesthetic-focused builds with ARGB synchronization across an ASUS ROG ecosystem.
Trade-offs
- Systems requiring more than 850W sustained output; dual-GPU or extreme multi-card configurations demand higher-capacity units.
- Non-ATX 3.1 or older PCIe Gen 4 systems where the 16-pin connector and voltage regulation upgrades offer no benefit.
- Builds without ASUS or ROG motherboards, since Aura Sync RGB customization cannot be fully leveraged.
- Budget-constrained builds; Platinum efficiency certification and 10-year warranty command a price premium over Bronze or Gold alternatives.
Taking after the ROG Thor, the ROG Loki SFX-L 850W Platinum brandishes the same enthusiast-grade components and features, all packed into an SFX-L form factor.
- Compact Form Factor SFX-L : 125 x 125 x 63.5 mm
- PCIe Gen 5.1 Ready 16-pin cable included to pipe up to 600W power to PCIe 5.1 graphics cards
- Future Ready Tighter voltage and current regulation
- Lambda A Certification Certified low noise levels, below 25 dB
- ARGB-Illuminated Fan & Aura Sync Ready to synchronize lighting effects across your gaming setup
COOLING
ROG Heatsinks — Cool under pressure
ROG heatsinks facilitate lower temperatures, longer component lifespan, and extended 0dB operation.
Axial-tech Fan Design — Better, faster, stronger
Axial-tech fan design features a smaller fan hub that facilitates longer blades and a barrier ring that increases downward air pressure. For ROG Loki PSUs, we've scaled that design to 120mm so it keeps things cool at low RPMs while producing less noise.
Dual Ball Fan Bearings — 2x longer lifespan
Dual ball bearings boast a remarkable lifespan of 80,000 hours, lasting twice as long as sleeve bearings and exceeding even fluid dynamic bearings. Ensuring long-lasting, reliable cooling with minimal noise for ROG Loki SFX-L series.
0dB Technology — Quiet intelligence
To reduce noise output, the PWM-controlled fan shuts off entirely when the PSU load is 40% or below.
ENGINEERING
High-performance Copper Pins
Upgraded PCIe® connectors featuring superior thermal conductivity ensure cooler operation and improved power delivery efficiency. This translates to a significant 29% reduction in connector temperatures (up to -12.28°C), promoting optimal performance and stability for even the most demanding graphics cards.
ATX 3.1 Compatible — Step into the future
The latest power specification updates have landed. ATX 3.1 ushers in tighter voltage and current regulation guidelines for next-gen hardware - and ROG Loki steps ahead of the curve by being fully compliant. A 16-pin PCIe cable ripe for piping up to 600W of power to PCIe Gen 5.1 graphics cards is bundled with the PSU, bringing large-scale capabilities to SFF rigs.
80 PLUS Platinum & Cybenetics Platinum Certified — Effortless output
The ROG Loki 850W Platinum achieves 80 PLUS Platinum and Cybenetics Platinum certifications by leveraging low-ESR Japanese capacitors that deliver stability and efficiency, leading to improved power consumption, heat generation, acoustics and reliability.
EXPERIENCE
ARGB-illuminated Fan & Aura Sync — Magical glow
The Loki's 120 mm fan features eight addressable LEDs ready to be customized with Aura Sync to create coordinated lighting patterns across your build.
- If the connector cable is not used, the default color effect is rainbow.
- To enjoy Aura Sync, you'll need an Aura Sync-compatible ASUS or ROG motherboard.
- Similarly, the Smart Mode lighting effect, which reflects GPU temperature, requires use of a compatible ASUS or ROG graphics card.
10-Year Warranty — A decade of power
We're so confident about the reliability of the ROG Loki SFX-L 850W Platinum that we back it with a 10-year warranty. *Core product operation is guaranteed for 10 years. The RGB LEDs are subject to a 3-year warranty.
General
| Brand | ASUS ROG |
|---|---|
| Model | ROG LOKI SFX-L 850W Platinum |
| ATX Standard | ATX 3.1 |
| Form Factor | SFX-L |
Power & Efficiency
| Total Output | 850W |
|---|---|
| 80 PLUS Rating | Platinum (up to 92% efficient) |
| Cybenetics Rating (230V) | Platinum |
| Cybenetics Rating (115V) | Platinum |
| PFC Type | Active PFC |
| AC Input Range | 100–240 Vac |
Connectors & PCIe Support
| PCIe Gen 5.1 Support | Yes; 16-pin connector rated 600W (included) |
|---|---|
| Motherboard Connector | 24/20-pin × 1 |
| CPU Connectors | 4+4-pin × 2 |
| PCIe 8-pin Connectors | 3 |
| SATA Connectors | 6 |
| Peripheral Connectors | 4 |
Cooling & Noise
| Fan Size | 120 mm axial-tech design |
|---|---|
| Fan Bearing Type | Dual ball bearing |
| Fan Lifespan | 80,000 hours MTBF |
| 0dB Technology | Supported; fan shuts off at ≤40% load |
| Noise Certification | Lambda A (below 25 dB) |
| MTBF | >120,000 hours @ 25°C |
Physical & Features
| Dimensions | 125 × 125 × 63.5 mm |
|---|---|
| Weight | 1.815 kg (single PSU) |
| ARGB Fan Lighting | 8 addressable LEDs; Aura Sync compatible |
| Protection Features | OPP, OVP, UVP, SCP, OCP, OTP |
| RoHS Compliant | Yes |
| Warranty | 10-year (core product); 3-year (RGB LEDs) |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.