ASUS ROG Loki SFX-L 850W Platinum (Fully Modular Power Supply, 80+ Platinum, Lambda A Certified, 120mm PWM ARGB Fan, Aura Sync, ATX 3.0 Compatible, PCIe 5.0 Ready, 10 Year Warranty)
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AI Verdict
An 850W 80+ Platinum SFX-L PSU with a 120mm PWM ARGB fan and 10-year warranty, built for small form factor gaming PCs needing ATX 3.0 and PCIe 5.0 power.
This 850W SFX-L power supply is a strong fit for high-performance small form factor gaming PCs, especially those using current or next-gen GPUs that demand ATX 3.0 and PCIe 5.0 power. Its 80+ Platinum efficiency and Lambda A noise certification directly address the needs of compact, powerful builds.
If your case only supports true SFX and not SFX-L, you'll need to look for a power supply with a standard SFX form factor (125 x 100 x 63.5 mm).
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Pros
- Provides 850 watts of power with 80 Plus Platinum efficiency, reaching up to 92% efficiency.
- Features a 120mm PWM ARGB fan and Lambda A Certification, ensuring noise levels below 25 dB.
- Includes a 16-pin PCIe 5.0 cable capable of delivering up to 600W to graphics cards.
- Comes with individually sleeved, flexible fully modular cables for easier routing.
- Backed by a 10-year warranty, indicating long-term manufacturer support.
- Utilizes 105°C Japanese capacitors for enhanced durability and stability.
Cons
- The SFX-L form factor (125 x 125 x 63.5 mm) is longer than standard SFX, potentially limiting compatibility with some compact cases.
- Ripple on the 12V rail was measured at 51mV under full load, which is higher than some competitors, though still within ATX specifications.
- The price point is on the premium side for an SFX-L power supply.
Dimension Scores
Achieves 80 Plus Platinum certification with up to 92% efficiency and provides a stable 850W output with tight voltage regulation.
Features Lambda A Certification for noise levels below 25 dB and a 120mm PWM fan with Axial-tech cooling for quiet operation.
Incorporates ROG heatsinks, 105°C Japanese capacitors, and a 10-year warranty, indicating robust construction.
Offers fully modular, individually sleeved, and flexible cables, including a dedicated 16-pin PCIe 5.0 cable, simplifying routing.
Best For
- Small form factor (SFF) PC builds requiring high wattage in an SFX-L compatible case.
- Gaming systems with high-power PCIe Gen 5.0 graphics cards like an RTX 4090 or upcoming GPUs.
- Users prioritizing low noise operation in their compact gaming rig, certified below 25 dB.
- Enthusiasts who want synchronized ARGB lighting within their PC build via Aura Sync.
Not Recommended For
- Ultra-compact ITX cases that only support true SFX power supplies, not SFX-L.
- Budget-focused PC builds where cost is the primary concern over premium features or certifications.
- Users who prefer a completely silent, fanless power supply under low loads (this unit has a hybrid fan mode).
Watch Out For
- The SFX-L form factor means it's 2.5cm longer than a standard SFX unit, which can prevent installation in specific small cases.
- While within spec, the 12V rail ripple of 51mV under full load is on the higher side compared to some other premium PSUs.
- Some users report the included 16-pin cable can be stiff, making cable management challenging in very tight SFF cases.
Full Specifications
| ASIN | B0BZFPPT6C |
| Brand | ASUS |
| Color | ROG-LOKI-850P-SFX-L-GAMING |
| Series | ROG-LOKI-850P-SFX-L-GAMING |
| Wattage | 850 watts |
| Model Name | ROG-LOKI-850P-SFX-L-GAMING |
| Form Factor | ATX |
| Item Weight | 4 pounds |
| Manufacturer | ASUS |
| Connector Type | ATX |
| Cooling Method | Air |
| Output Wattage | 850.0 |
| Item model number | ROG-LOKI-850P-SFX-L-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 biggest takeaway from users is how quiet this 850W SFX-L unit runs, often being described as one of the quietest components in their SFF builds, even under load. The individually sleeved cables are a recurring highlight, making cable routing less of a headache in tight spaces. While the SFX-L form factor is a known consideration, most users confirm it fits their intended cases, but it's a critical check before buying. The inclusion of the 16-pin PCIe 5.0 cable is a significant draw for those with power-hungry modern GPUs.
“Man, this thing is QUIET, like, seriously, I can barely hear it over my case fans, and the cables actually look decent, not those ugly ribbon ones. Worth the extra cash for my tiny build.”
Common Praise
- The 120mm fan is extremely quiet, often inaudible during typical use.
- Individually sleeved cables are flexible and make cable management easier in small cases.
- The 16-pin PCIe 5.0 cable is included and works as expected with high-end graphics cards.
- The ARGB lighting integrates well with Aura Sync for a cohesive aesthetic.
- The power supply maintains stable voltages even under demanding loads.
Common Complaints
- The SFX-L form factor can be a tight squeeze or incompatible with some cases designed strictly for SFX PSUs.
- The price is higher than many other SFX-L options, making it a premium purchase.
- Some found the 16-pin PCIe cable to be a bit stiff, requiring careful bending in very compact builds.
Ownership Tips
- The hybrid fan mode means the fan often stays off during light tasks, contributing to a silent desktop experience.
- The ARGB lighting is subtle and not overly bright, blending into most builds without being distracting.
- The unit runs cool, even when pushing a high-end GPU, thanks to the ROG heatsinks.
- The 10-year warranty provides peace of mind for future upgrades and system longevity.
Frequently Asked Questions
Is this power supply compatible with older graphics cards that use 8-pin PCIe connectors?
Yes, this power supply is fully modular and includes standard PCIe 6+2 pin connectors for compatibility with older graphics cards, in addition to the new 16-pin PCIe 5.0 cable.
Can I turn off the ARGB lighting on the fan?
Yes, the ARGB lighting is Aura Sync compatible, allowing you to control or disable the lighting effects through ASUS's software.
What is the physical size of this power supply?
The ASUS ROG Loki SFX-L 850W Platinum measures 125 x 125 x 63.5 mm.
Does this PSU come with all the necessary cables for a modern build?
Yes, it's fully modular and includes a comprehensive set of cables, notably the 16-pin PCIe 5.0 cable for up to 600W GPUs, and individually sleeved cables.
Is the fan always spinning?
No, it features a hybrid fan mode, meaning the 120mm PWM fan can operate passively under low loads for silent operation.
Buying Guide
When picking a power supply for a small PC, you need to think about more than just wattage. The physical size, especially SFX vs. SFX-L, is critical for case compatibility. You also want to check for certifications like 80 Plus Platinum for efficiency and noise ratings like Lambda A if quiet operation matters to you. Don't forget the cables – fully modular and flexible ones make your life so much easier in a cramped case.
wattage
This is how much power your PSU can deliver. Think of it like the engine size in a car; too small and your PC won't run, too big and you're paying for power you don't need. Match it to your CPU and GPU's power demands.
form_factor
This dictates the physical size of the power supply. SFX-L is a slightly longer version of SFX, so always double-check your case's specifications to ensure it will physically fit. It's like trying to fit a large suitcase into a small overhead bin.
rating
The 80 Plus Platinum rating tells you how efficiently the PSU converts wall power into usable PC power. Higher efficiency means less wasted energy as heat, which can lead to a cooler and quieter system, and lower electricity bills. It's like getting better gas mileage for your computer.
modular
Fully modular means you only plug in the cables you need. This is a huge win for cable management, especially in small cases, as it reduces clutter and improves airflow. It's like having custom-length cables instead of a tangled mess.
Alternatives
If this unit doesn't fit, look for SFX form factor power supplies with similar wattage and 80 Plus Platinum efficiency. If the budget is tighter, consider 80 Plus Gold rated units, but expect slightly lower efficiency and potentially more noise.
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