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Corsair TX650M Power Supply Review: Quietly Good

A quiet and decent-performing PSU

Corsair TX650M
(Image: © Tom's Hardware)

Protection Features

Check out our PSUs 101 article to learn more about PSU protection features.

Protection Features
OCP (Cold @ 26°C)12V: 68.4A (134.12%), 11.951V
5V: 36.5A (146%), 4.915V
3.3V: 37.6A (150.4%), 3.257V
5VSB: 5.5A (183.33%), 5.039V
OCP (Hot @ 42°C)12V: 68.2A (133.73%), 11.960V
5V: 35.6A (142.4%), 4.921V
3.3V: 37.2A (148.8%), 3.257V
5VSB: 5.5A (183.33%), 5.038V
OPP (Cold @ 27°C)817.5W (133.58%)
OPP (Hot @ 43°C)815.7W (133.28%)
OTP✓ (181°C @ 12V Heat Sink)
SCP12V to Earth: ✓
5V to Earth: ✓
3.3V to Earth: ✓
5VSB to Earth: ✓
-12V to Earth: ✓
PWR_OKAccurate but lower than 16ms
NLO
SIPSurge: MOV
Inrush: NTC Thermistor & Bypass relay

Under hot and cold conditions, the OCP triggering points are correctly set for the 12V rail, but too high for the minor rails. There is no need for 37A at 3.3V! 

DC Power Sequencing

According to Intel’s most recent Power Supply Design Guide (revision 1.4), the +12V and 5V outputs must be equal to or greater than the 3.3V rail at all times. Unfortunately, Intel doesn't mention why it is so important to always keep the 3.3V rail's voltage lower than the levels of the other two outputs.

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Corsair TX650M

(Image credit: Tom's Hardware)
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Corsair TX650M

(Image credit: Tom's Hardware)
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Corsair TX650M

(Image credit: Tom's Hardware)

No problems here since the 3.3V rail is always lower than the other two. 

Cross Load Tests

To generate the following charts, we set our loaders to auto mode through custom-made software before trying more than 25,000 possible load combinations with the +12V, 5V, and 3.3V rails. The deviations in each of the charts below are calculated by taking the nominal values of the rails (12V, 5V, and 3.3V) as point zero. The ambient temperature during testing was between 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit).

Load Regulation Charts

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Corsair TX650M

(Image credit: Tom's Hardware)
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Corsair TX650M

(Image credit: Tom's Hardware)
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Corsair TX650M

(Image credit: Tom's Hardware)
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Corsair TX650M

(Image credit: Tom's Hardware)

Efficiency Graph

(Image credit: Tom's Hardware)

Ripple Graphs

The lower the power supply's ripple, the more stable the system will be and less stress will also be applied to its components.

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Corsair TX650M

(Image credit: Tom's Hardware)
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Corsair TX650M

(Image credit: Tom's Hardware)
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Corsair TX650M

(Image credit: Tom's Hardware)
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Corsair TX650M

(Image credit: Tom's Hardware)

Infrared Images

We apply a half-load for 10 minutes with the PSU's top cover and cooling fan removed before taking photos with a modified Fluke Ti480 PRO camera able to deliver an IR resolution of 640x480 (307,200 pixels).

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Corsair TX650M

(Image credit: Tom's Hardware)
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Corsair TX650M

(Image credit: Tom's Hardware)
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Corsair TX650M

(Image credit: Tom's Hardware)

The hottest parts are two diodes right next to the standby transformer. These diodes belong to the 5VSB circuit, and at 100 degrees Celsius, their derating factor is 50%. They form a clamp circuit for the voltage going to the 5VSB circuit's controller. The temperatures on the other parts are low. 

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