Corsair RM750 Power Supply Review: Affordable Yet Powerful

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Protection Features, DC Power Sequencing, Cross-Load Tests and Infrared Images

Protection Features

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

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Protection Features
OCP12V: 78.4A (125.44%), 11.993V 5V: 29.6A (148%), 5.023V 3.3V: 30.5A (152.5%), 3.281V 5VSB: 5.2A (173.33%), 4.926V
OPP956.5W (127.53%)
OTP✓ (98°C @ secondary side)
SCP12V: ✓ 5V: ✓ 3.3V: ✓ 5VSB: ✓ -12V: ✓
PWR_OKProper Operation
SIPSurge: MOV Inrush: NTC Thermistor & Bypass Relay

The over current protection (OCP) triggering points on the minor rails should be set lower, within 130% of the max nominal values. The over power protection (OPP) doesn't allow the unit to deliver more than 960W of power, while there is protection against high operating temperatures.

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.

The 3.3V rail is always lower than the other two rails. 

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

Efficiency Chart

It would be nice to see a region with efficiency numbers exceeding 92%. 

Ripple Charts

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

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 FLIR E4 camera able to deliver an IR resolution of 320x240 (76,800 pixels).

Low temperatures at the internals. As usual, the hottest area is the one hosting the DC-DC converters, because we apply a heavy load on the minors rails. The majority of power supplies don't have beefy heat sinks on those converters, so we push them hard in these tests to see how hot they can get.

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Contributing Editor

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