ASUS ROG Loki SFX-L 850W Platinum White Edition (Fully Modular Power Supply, 80+ Platinum, 120mm PWM ARGB Fan, Aura Sync, ATX 3.0 Compatible, PCIe 5.0 Ready, 10 Year Warranty)
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AI Verdict
A 850W 80+ Platinum SFX-L power supply with ATX 3.0 and PCIe 5.0 readiness for high-power small form factor builds.
This 850W SFX-L power supply is a strong fit for high-end small form factor builds, especially those with power-hungry ATX 3.0 and PCIe 5.0 GPUs. Its 80+ Platinum efficiency and Lambda A noise certification cater to users demanding both performance and quiet operation in a compact chassis.
If your case strictly requires a true SFX form factor (100mm depth), look for power supplies without the 'L' designation to ensure compatibility.
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Pros
- Provides 850 watts of power with 80+ Platinum efficiency, reaching up to 92% efficiency for reduced heat and energy waste.
- Includes a 16-pin PCIe cable capable of delivering up to 600W to PCIe Gen 5.0 graphics cards, compliant with ATX 3.0 guidelines.
- Features a 120mm PWM fan and ROG heatsinks, contributing to Lambda A certified low noise levels below 25 dB.
- Offers a fully modular design with flexible, individually sleeved cables for streamlined cable management.
- Backed by a 10-year warranty, indicating manufacturer confidence in its long-term durability.
- Integrates ARGB lighting on the fan and unit sides, compatible with Aura Sync for synchronized lighting effects.
Cons
- The SFX-L form factor (125 x 125 x 63.5 mm) is longer than standard SFX, potentially causing fitment issues in ultra-compact SFX-only cases.
- Some users report an 'annoying humming' or coil whine, particularly when paired with certain GPUs like the RTX 4070.
- The integrated ARGB fan is not optional, which may be an unnecessary feature for users prioritizing stealth or specific aesthetics.
- The white color scheme, while aesthetic, might limit compatibility with non-white themed builds.
Dimension Scores
The 850 watts of power combined with 80+ Platinum certification (up to 92% efficiency) provides high-tier performance for its size.
Achieving Lambda A certification for noise levels below 25 dB, supported by a 120mm PWM fan and ROG heatsinks, positions it as a very quiet unit.
Incorporates ROG heatsinks, low-ESR Japanese capacitors, and comes with a 10-year warranty, indicating robust construction and component selection.
Its fully modular design and user-reported flexible, individually sleeved cables significantly simplify routing in confined SFF cases.
Best For
- High-performance Small Form Factor (SFF) gaming PCs requiring 850W for modern GPUs.
- PC builds utilizing ATX 3.0 and PCIe 5.0 graphics cards, like RTX 40-series.
- White-themed custom PC builds where aesthetics are a priority.
- Users prioritizing quiet operation in a compact power supply.
Not Recommended For
- Ultra-compact cases that strictly support only true SFX power supplies (100mm depth).
- Budget-focused builds where premium features like ARGB and Platinum efficiency are not essential.
- Users sensitive to potential coil whine under specific loads.
Watch Out For
- The SFX-L form factor (125mm depth) can block bottom-mounted fans or make cable routing difficult in some very small SFX cases, such as the Terra or A4-H20.
- Some users have experienced an 'annoying humming' or coil whine from the unit when under load, specifically noted with an RTX 4070.
- The ARGB fan is a permanent feature; users who prefer a non-RGB setup or want to avoid potential points of failure for lighting cannot disable it physically.
Full Specifications
| ASIN | B0BZFFHXDF |
| Brand | ASUS |
| Color | ROG-LOKI-850P-SFX-L-WHITE-GAMING |
| Series | ROG-LOKI-850P-SFX-L-WHITE-GAMING |
| Wattage | 850 watts |
| Model Name | ROG-LOKI-850P-SFX-L-WHITE-GAMING |
| Form Factor | ATX |
| Item Weight | 4 pounds |
| Manufacturer | ASUS |
| Connector Type | SFX |
| Cooling Method | Air |
| Output Wattage | 850.0 |
| Item model number | ROG-LOKI-850P-SFX-L-WHITE-GAMING |
| Compatible Devices | Desktop, Personal Computer |
| Product Dimensions | 4.9 x 4.9 x 2.5 inches |
| Item Dimensions LxWxH | 4.9 x 4.9 x 2.5 inches |
| Item dimensions L x W x H | 4.9 x 4.9 x 2.5 inches |
What Buyers Say
The ASUS ROG Loki SFX-L 850W Platinum is frequently praised for its ability to power high-end components in small builds, specifically its ATX 3.0 and PCIe 5.0 readiness. Many users highlight its quiet operation, often noting the fan is barely audible even under load. However, the SFX-L form factor is a recurring discussion point, as its slightly longer depth can be a tight squeeze or incompatible with some ultra-compact SFX-only cases. The white aesthetic and ARGB lighting are either a major draw or an unnecessary addition, depending on user preference.
“Man, this thing is QUIET, like, I thought my old PSU was quiet but this Loki just disappears into the background, even with my 4080 going full tilt. The white cables are a pain to bend in my tiny case but it looks so clean!”
Common Praise
- Provides stable power for high-wattage GPUs like the RTX 40-series.
- The 16-pin PCIe 5.0 cable is included and ready for next-gen graphics cards.
- Operates with very low noise levels, often described as inaudible during typical use.
- The fully modular design and flexible cables make installation and routing in SFF cases less frustrating.
- The white finish and ARGB lighting integrate well into themed builds.
Common Complaints
- The SFX-L size (125mm depth) is too long for some specific SFX cases, preventing proper closure or fan installation.
- Reports of coil whine or an 'annoying humming' sound under load, particularly with certain GPU models.
- The ARGB fan is not switchable or removable, which some users find unnecessary or a potential point of failure.
Ownership Tips
- The included ATX to SFX adapter bracket is useful for broader case compatibility, even if not strictly needed for SFX-L cases.
- The clear fan blades allow the ARGB lighting to be visible, which is a plus for RGB enthusiasts.
- The flexibility of the braided cables is a real asset when trying to manage wiring in cramped SFF enclosures.
- The 16-pin PCIe cable comes in two types, one with sense wires and one without, offering options depending on the GPU.
Frequently Asked Questions
Is the ASUS ROG Loki SFX-L 850W compatible with the latest graphics cards?
Yes, it is ATX 3.0 compatible and PCIe 5.0 ready, including a 16-pin cable that can deliver up to 600W to modern GPUs.
How quiet is this power supply?
It features a 120mm PWM fan and ROG heatsinks, achieving Lambda A certification for noise levels below 25 dB, making it very quiet in operation.
Will this fit in my small form factor case?
It has an SFX-L form factor (125 x 125 x 63.5 mm). While compatible with most SFX-L cases, verify your case supports the slightly longer 125mm depth, as some ultra-compact SFX-only cases may have clearance issues.
Does it come with an ATX to SFX adapter bracket?
Yes, the package includes an ATX to SFX adapter bracket for broader case compatibility.
Are the cables flexible for tight SFF builds?
Users have reported the fully modular, individually sleeved cables are 'pretty flexible,' aiding in cable management within compact spaces.
Buying Guide
When you're looking at a power supply like this, especially for a small PC, you need to think about more than just wattage. The 'SFX-L' form factor means it's a bit longer than standard 'SFX' units, so double-check your case's specifications to avoid fitment headaches. Also, 'ATX 3.0' and 'PCIe 5.0' aren't just buzzwords; they mean this PSU is built to handle the power spikes and dedicated 16-pin connectors of the newest, most demanding graphics cards, which is crucial for stability and future-proofing.
wattage
This number (850 watts here) tells you the maximum power your PSU can deliver. For modern gaming PCs with high-end CPUs and GPUs, you need enough wattage to prevent crashes and ensure stable performance, especially during peak loads.
form_factor
This dictates the physical size of the power supply. 'SFX-L' means it's designed for smaller cases but is slightly longer than the smallest 'SFX' units. If your case only supports 'SFX', an 'SFX-L' unit won't fit, so measure your case's PSU bay carefully.
80+ Platinum
This certification indicates how efficiently the PSU converts wall power into usable PC power. 'Platinum' means it's very efficient (up to 92%), wasting less energy as heat. This saves you a tiny bit on your electricity bill and helps keep your PC cooler.
ATX 3.0 Compatible, PCIe 5.0 Ready
These standards are essential for the latest graphics cards. ATX 3.0 handles transient power spikes better, preventing system instability, and PCIe 5.0 means it has the dedicated 16-pin connector for cards like NVIDIA's RTX 40-series, eliminating the need for bulky adapters.
Alternatives
If this unit's SFX-L size is too large, search for true SFX power supplies with a 100mm depth. If 850W isn't enough for an extreme multi-GPU setup or future proofing, look for higher wattage SFX-L units.
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