Corsair TX650M Power Supply Review: Quietly Good

A quiet and decent-performing PSU

Corsair TX650M
(Image: © Tom's Hardware)

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Advanced Transient Response Tests

For details about 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 also choose to apply a worst case scenario with no additional capacitance on the rails. 

Advanced Transient Response at 20% – 20ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V12.021V11.687V2.77%Pass
5V4.990V4.881V2.19%Pass
3.3V3.286V3.112V5.29%Fail
5VSB5.033V4.982V1.00%Pass

Advanced Transient Response at 20% – 10ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V12.018V11.738V2.33%Pass
5V4.991V4.876V2.31%Pass
3.3V3.287V3.127V4.87%Fail
5VSB5.033V4.977V1.10%Pass

Advanced Transient Response at 20% – 1ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V12.017V11.703V2.61%Pass
5V4.990V4.878V2.24%Pass
3.3V3.286V3.117V5.16%Fail
5VSB5.033V4.961V1.43%Pass

Advanced Transient Response at 50% – 20ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V11.979V11.788V1.59%Pass
5V4.972V4.858V2.30%Pass
3.3V3.273V3.091V5.55%Fail
5VSB5.012V4.960V1.05%Pass

Advanced Transient Response at 50% – 10ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V11.978V11.815V1.36%Pass
5V4.972V4.844V2.58%Pass
3.3V3.273V3.096V5.40%Fail
5VSB5.011V4.942V1.38%Pass

Advanced Transient Response at 50% – 1ms

Swipe to scroll horizontally
VoltageBeforeAfterChangePass/Fail
12V11.977V11.800V1.47%Pass
5V4.972V4.865V2.16%Pass
3.3V3.273V3.088V5.64%Fail
5VSB5.011V4.954V1.13%Pass

Transient response is not that good, especially at 3.3V. 

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.

There is a notable step at 5VSB. On the contrary, transient response is perfect at 12V. 

Power Supply Timing Tests

There are several signals generated by the power supply, which need to be within specified, by the ATX spec, ranges. If they are not, there can be compatibility issues with other system parts, especially mainboards. From year 2020, the PSU's Power-on time (T1) has to be lower than 150ms and the PWR_OK delay (T3) from 100 to 150ms, to be compatible with the Alternative Sleep Mode.

Swipe to scroll horizontally
PSU Timings Table
T1 (Power-on time) & T3 (PWR_OK delay)
LoadT1T3
20%33.5ms133ms
100%33ms132.5ms

The PWR_OK delay is within the 100-150ms region, so the PSU supports the alternative sleep mode recommended by the ATX spec.

Ripple Measurements

Ripple represents the AC fluctuations (periodic) and noise (random) found in the PSU's DC rails. This phenomenon significantly decreases the capacitors' lifespan because it causes them to run hotter. A 10-degree Celsius increase can cut into a cap's useful life by 50%. Ripple also plays an important role in overall system stability, especially when overclocking is involved.

The ripple limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

Swipe to scroll horizontally
Test12V5V3.3V5VSBPass/Fail
10% Load7.5 mV7.0 mV7.0 mV12.1 mVPass
20% Load14.6 mV6.7 mV7.1 mV12.5 mVPass
30% Load32.2 mV7.5 mV8.0 mV12.2 mVPass
40% Load28.4 mV9.5 mV9.1 mV13.4 mVPass
50% Load28.0 mV22.2 mV25.3 mV16.9 mVPass
60% Load26.4 mV12.6 mV12.1 mV15.1 mVPass
70% Load26.3 mV16.9 mV14.5 mV15.0 mVPass
80% Load23.8 mV15.1 mV17.5 mV15.8 mVPass
90% Load23.4 mV15.8 mV19.1 mV15.8 mVPass
100% Load40.3 mV17.7 mV19.0 mV23.0 mVPass
110% Load40.3 mV17.9 mV21.4 mV22.8 mVPass
Crossload 116.6 mV10.1 mV15.7 mV14.5 mVPass
Crossload 211.0 mV8.9 mV6.6 mV10.9 mVPass
Crossload 313.6 mV6.0 mV16.4 mV11.1 mVPass
Crossload 440.1 mV12.0 mV13.8 mV16.7 mVPass

Ripple suppression is decent at 12V, but we would like to see below 30mV since the competition is tough in this area. 

Ripple At Full Load

Ripple At 110% Load

Ripple At Cross-Load 1

Ripple At Cross-Load 4

EMC Pre-Compliance Testing – Average & Quasi-Peak EMI Detector Results

Electromagnetic Compatibility (EMC) is the ability of a device to operate properly in its environment without disrupting the proper operation of other nearby devices.

Electromagnetic Interference (EMI) stands for the electromagnetic energy a device emits, and it can cause problems in other nearby devices if too high. For example, it can be the cause of increased static noise in your headphones or/and speakers.

(Image credit: Tom's Hardware)

EMI emissions are low. 

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MORE: How We Test Power Supplies

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Aris Mpitziopoulos
Contributing Editor

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

  • daris98
    Seems that they did a good job at keeping things in check. Everything is better than its predecessor, though, I was expecting that It'd be a good lot quieter. What I'm hoping is that they will be able to sell this for cheap in my country. The Enermax Revolution DF sells for cheaper than the old TX650M and I see no reason why I should get the TX. Hopefully the new version will be cheaper than the DF.
    Reply