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Corsair AX1000 PSU Review: Titanium-Class Efficiency, at a Premium Price

Editor's Choice

Transient Response Tests, Ripple Measurements and EMC Pre-Compliance Testing

Advanced Transient Response Tests

For details on our transient response testing, please click here.

In the real world, power supplies are always working with loads that change. It's of immense importance, then, for the PSU to keep its rails within the ATX specification's defined ranges. The smaller the deviations, the more stable your PC will be with less stress applied to its components. 

We should note that the ATX spec requires capacitive loading during the transient rests, but in our methodology we chose to apply the worst case scenario with no extra capacitance on the rails. 

Advanced Transient Response at 20 Percent – 200ms

VoltageBeforeAfterChangePass/Fail
12V12.166V12.075V0.75%Pass
5V5.050V5.001V0.97%Pass
3.3V3.356V3.285V2.12%Pass
5VSB5.036V5.001V0.69%Pass

Advanced Transient Response at 20 Percent – 20ms

VoltageBeforeAfterChangePass/Fail
12V12.166V12.041V1.03%Pass
5V5.051V4.993V1.15%Pass
3.3V3.356V3.269V2.59%Pass
5VSB5.037V4.999V0.75%Pass

Advanced Transient Response at 20 Percent – 1ms

VoltageBeforeAfterChangePass/Fail
12V12.165V12.071V0.77%Pass
5V5.052V4.993V1.17%Pass
3.3V3.357V3.262V2.83%Pass
5VSB5.038V4.987V1.01%Pass

Advanced Transient Response at 50 Percent – 200ms

VoltageBeforeAfterChangePass/Fail
12V12.158V12.128V0.25%Pass
5V5.044V4.997V0.93%Pass
3.3V3.353V3.279V2.21%Pass
5VSB5.023V4.975V0.96%Pass

Advanced Transient Response at 50 Percent – 20ms

VoltageBeforeAfterChangePass/Fail
12V12.158V12.107V0.42%Pass
5V5.044V4.989V1.09%Pass
3.3V3.353V3.264V2.65%Pass
5VSB5.024V4.977V0.94%Pass

Advanced Transient Response at 50 Percent – 1ms

VoltageBeforeAfterChangePass/Fail
12V12.157V12.113V0.36%Pass
5V5.045V4.989V1.11%Pass
3.3V3.354V3.262V2.74%Pass
5VSB5.025V4.962V1.25%Pass
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The results from each rail are very good. Particularly on the all-important +12V rail, registered deviations are low.

Turn-On Transient Tests

In the next set of tests, we measure the PSU's response in simpler transient load scenarios—during its power-on phase. Ideally, we don't want to see any voltage overshoots or spikes since those put a lot of stress on the DC-DC converters of installed components.

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There aren't any notable spikes or voltage overshoots to report, so everything checks out.

Ripple Measurements

Test12V5V3.3V5VSBPass/Fail
10% Load12.5mV9.7mV12.9mV10.7mVPass
20% Load13.0mV5.2mV10.8mV12.7mVPass
30% Load6.7mV5.0mV10.1mV9.1mVPass
40% Load7.7mV6.4mV9.1mV7.3mVPass
50% Load8.4mV5.0mV8.7mV7.2mVPass
60% Load8.8mV5.2mV9.0mV7.4mVPass
70% Load9.7mV5.3mV9.1mV8.2mVPass
80% Load10.4mV5.5mV9.8mV8.5mVPass
90% Load10.9mV5.6mV10.1mV8.4mVPass
100% Load15.2mV6.5mV10.7mV9.6mVPass
110% Load15.7mV6.6mV11.0mV9.9mVPass
Cross-Load 115.2mV5.2mV11.6mV7.0mVPass
Cross-Load 215.1mV6.2mV9.5mV9.0mVPass
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Ripple At Full Load

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Ripple At 110-Percent Load

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Ripple At Cross-Load 1

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Ripple At Cross-Load 2

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EMI Results – Average & Peak Detector

The EMI emissions we observe remain much lower than their allowable limits. Obviously, the AX1000's EMI filter does its job well.

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Aris Mpitziopoulos
Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.