
The ASUS ROG LOKI SFX-L 1000W is a 1000W fully modular, SFX-L form factor, ATX 3.0 power supply with a single hybrid fan mode. As of publication date, it is priced at $249.99 USD MSRP.
Performance tests revealed acceptable overall performance from this power supply, though it struggled to maintain operation during some power excursions without leading to a complete failure. Its standout features are excellent load regulation and high efficiency at low loads, making it an ideal choice for users seeking reliability and energy savings.
WHAT YOU NEED TO KNOW
THE GOOD
- Efficiency
Achieves an impressive 92% efficiency at 50% load, ranking among the most energy-efficient Platinum-rated power supplies we've tested for mid-range demands.
- Load Regulation
Delivers excellent load regulation with a minimal 0.109 V drop on the 12V rail, ensuring consistent voltage under varying loads.
THE BAD
- Excursions
Struggles with power excursions, failing to sustain operation during several excursion tests.
THE REST
- Overall
The ASUS ROG LOKI SFX-L 1000W is a highly efficient and well-regulated power supply with premium features, but its power excursion limitations may deter users with demanding setups.
The ASUS ROG LOKI SFX-L 1000W is an SFX-L form factor power supply, which is slightly longer than the SFX units by 30 mm, yet still compact enough for small form factor builds. The unit comes with a range of accessories, including Velcro cable ties, a cable bag, and a cable for Aura RGB lighting effects. The included cables are high-quality, flexible cables with a braided-etched pattern, which makes cable management easier.
For cooling, the unit is equipped with a 120 mm dual ball bearing fan, which is larger than typical SFX fans, enhancing cooling performance. However, operating temperature is not specified by the manufacturer, and we are unable to verify this through testing.
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Front of the box.
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Power input side of the PSU.

Top of the PSU displaying the fan.

Bottom of the PSU displaying the specifications.
+12 V | +5 V | +3.3 V | +5 Vsb | -12 V | |
---|---|---|---|---|---|
CURRENT | 83.3 A | 20 A | 20 A | 2.5 A | 0.8 A |
WATTAGE | 1000 W | 110 W | 12.5 W | 9.6 W | |
1000 W |
Please note that the above ratings are manufacturer advertised specifications.
The ROG LOKI SFX-L 1000W includes a hybrid fan mode, which ASUS markets as 0dB technology, ensuring the fan remains off when the PSU load is at or below 40%, reducing noise under low-load conditions. It comes with all of the standard protections expected from a high-end power supply and is backed by a 10-year warranty.
One notable feature is its support for Aura Sync, along with an ARGB illuminated fan that can be synchronized with other components in the system. ASUS includes a specific cable and Aura Sync connector to enable this functionality, providing users with aesthetic customization options.
In terms of performance, the ROG LOKI SFX-L 1000W demonstrated some good capabilities. During load regulation testing, there was only a 0.109 V voltage drop on the 12V rail across its full rated output power range of 1000W, which is well within ATX specifications. There was barely any difference in temperature or input voltage during this testing.
This power supply exceeded ATX ripple specifications at several test points, with the 12V rail exhibiting a peak-to-peak ripple of 64 mV. The 5V and 3.3V rails also showed elevated ripple levels, measuring 45 mV and 62 mV, respectively. While these values are slightly higher than average, they still remain within an acceptable range.
In power excursion tests, the ROG LOKI SFX-L 1000W successfully handled some excursions but failed during many others. In certain cases, it could not maintain operation after the excursion. While the resulting voltage surges are unlikely to damage components, they exceed specification limits, placing additional strain on downstream components to stabilize the voltage.
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The ROG LOKI SFX-L 1000W is 80PLUS Platinum certified, achieving 92% efficiency at 50% load, which is excellent for a power supply of this class. At 50% and lower loads, it ranks among the most efficient units we've tested, though its performance becomes more typical for Platinum-rated supplies at higher loads.
In brownout performance, it maintained a 16 ms dropout at full rated load for both 115V and 230V inputs, which is standard for its class. The OPP activated at 131% of the rated load, with the 12V rail delivering 109 A, also 131% of its rating. OCP for the main rails engaged within the expected 130-150% range. Some of the power excursion failures may have been from triggering these protections, though it’s difficult to confirm with certainty.
