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Gigabyte GP-P750GM Power Supply Review: Lacking the Explosive Character

Gigabyte's new GP-P750GM is less prone to fire, but still faces tough competition.

Gigabyte GP-P750GM
(Image: © Tom's Hardware)

Protection Features

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

OCP (Cold @ 25°C)12V: 71.6A (117.38%), 11.955V
5V: 23.9A (119.5%), 5.147V
3.3V: 23.9A (119.5%), 3.369V
5VSB: 4.4A (146.67%), 4.896V
OCP (Hot @ 44°C)12V: 71.4A (117.05%), 11.972V
5V: 22A (110%), 5.146V
3.3V: 21.9A (109.5%), 3.373V
5VSB: 4.4A (146.67%), 4.926V
OPP (Cold @ 25°C)856W (116.94%)
OPP (Hot @ 38°C)869.52W (115.94%)
OTP✓ (186°C @ secondary side)
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

The OPP and OCP triggering points are low, effectively protecting the unit from blowing. MEIC made the necessary changes on the PCB to make the PSU safer to use. 

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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In the "PSU OFF To Full Load" test for a short period, the 3.3V rail exceeds the voltage level of the 5V rail. We are more worried, though, about the drop at 12V, near the top of its rise. 

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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GP-P750GM

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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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GP-P750GM

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GP-P750GM

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GP-P750GM

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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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The temperatures are low. The hottest parts are the 12V heat sinks. 

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