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Gigabyte GP-P750GM 750 W Review - With an Explosive Attitude
Fan Noise »Efficiency
Using the results we gathered so far, we plotted a chart showing the PSU's efficiency at low loads and loads ranging from 10 to 110 percent of the maximum-rated capacity.
10%–110% Load Testing
These tests reveal the PSU's load regulation and efficiency levels under high ambient temperatures. They also show how the fan-speed profile behaves under harsh operating conditions.| Load Regulation & Efficiency Testing Data - Gigabyte P750GM | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Test | 12 V | 5 V | 3.3 V | 5VSB | Power (DC/AC) | Efficiency | Fan Speed | PSU Noise | Temp (In/Out) | PF/AC Volts |
| 10% Load | 4.437A | 1.959A | 1.961A | 0.988A | 74.969W | 87.148% | 0 RPM | <6.0 dB(A) | 44.19°C | 0.852 |
| 12.028V | 5.103V | 3.366V | 5.064V | 86.025W | 40.00°C | 230.25V | ||||
| 20% Load | 9.904A | 2.943A | 2.946A | 1.186A | 150.049W | 91.422% | 0 RPM | <6.0 dB(A) | 45.20°C | 0.930 |
| 12.031V | 5.096V | 3.359V | 5.059V | 164.127W | 40.52°C | 230.25V | ||||
| 30% Load | 15.722A | 3.437A | 3.444A | 1.387A | 225.061W | 92.730% | 989 RPM | 25.4 dB(A) | 41.14°C | 0.955 |
| 12.022V | 5.092V | 3.353V | 5.049V | 242.705W | 46.38°C | 230.24V | ||||
| 40% Load | 21.541A | 3.934A | 3.947A | 1.587A | 300.075W | 92.923% | 1019 RPM | 26.3 dB(A) | 41.99°C | 0.968 |
| 12.017V | 5.085V | 3.346V | 5.044V | 322.930W | 47.89°C | 230.24V | ||||
| 50% Load | 26.978A | 4.925A | 4.943A | 1.787A | 374.653W | 92.674% | 1039 RPM | 26.9 dB(A) | 42.22°C | 0.974 |
| 12.015V | 5.078V | 3.338V | 5.038V | 404.271W | 48.68°C | 230.24V | ||||
| 60% Load | 32.445A | 5.917A | 5.947A | 1.988A | 449.570W | 92.269% | 1133 RPM | 29.9 dB(A) | 42.52°C | 0.979 |
| 12.013V | 5.070V | 3.330V | 5.033V | 487.236W | 49.61°C | 230.24V | ||||
| 70% Load | 37.946A | 6.915A | 6.956A | 2.189A | 524.895W | 91.770% | 1303 RPM | 33.9 dB(A) | 43.03°C | 0.981 |
| 12.011V | 5.063V | 3.322V | 5.028V | 571.968W | 50.51°C | 230.24V | ||||
| 80% Load | 43.447A | 7.917A | 7.964A | 2.390A | 600.216W | 91.140% | 1485 RPM | 37.4 dB(A) | 43.79°C | 0.983 |
| 12.010V | 5.055V | 3.314V | 5.023V | 658.563W | 52.13°C | 230.24V | ||||
| 90% Load | 49.318A | 8.426A | 8.469A | 2.390A | 674.738W | 90.553% | 1636 RPM | 40.4 dB(A) | 44.34°C | 0.985 |
| 12.008V | 5.046V | 3.307V | 5.022V | 745.129W | 53.42°C | 230.24V | ||||
| 100% Load | 54.987A | 8.935A | 9.008A | 2.995A | 749.957W | 89.828% | 1768 RPM | 42.4 dB(A) | 46.46°C | 0.986 |
| 12.007V | 5.038V | 3.298V | 5.010V | 834.883W | 56.36°C | 230.24V | ||||
| 110% Load | 61.253A | 8.949A | 9.025A | 2.995A | 825.176W | 88.987% | 1871 RPM | 43.9 dB(A) | 47.25°C | 0.987 |
| 12.007V | 5.030V | 3.290V | 5.010V | 927.304W | 57.85°C | 230.24V | ||||
| Crossload 1 | 0.098A | 13.004A | 13.001A | 0.000A | 111.209W | 85.300% | 873 RPM | 21.6 dB(A) | 42.02°C | 0.907 |
| 12.035V | 5.098V | 3.364V | 5.085V | 130.374W | 48.37°C | 230.25V | ||||
| Crossload 2 | 61.012A | 1.000A | 1.000A | 1.000A | 745.898W | 90.575% | 1725 RPM | 42.1 dB(A) | 46.54°C | 0.986 |
| 12.006V | 5.037V | 3.300V | 5.050V | 823.517W | 57.04°C | 230.24V | ||||
The PSU can handle high operating temperatures, while keeping load regulation at +12 V very tight. Registered efficiency levels are also high in these tests.
Light Load Testing
In the following tests, we measure the PSU's efficiency at loads significantly lower than 10 percent of the maximum capacity (the lowest load the 80 PLUS standard measures). This is important for representing when a PC is idle with its power-saving features turned on.| Efficiency at Low Loads - Gigabyte P750GM | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Test # | 12 V | 5 V | 3.3 V | 5 VSB | Power (DC/AC) | Efficiency | Fan Speed | PSU Noise | PF/AC Volts |
| 1 | 2.902A | 0.489A | 0.489A | 0.197A | 40.040W | 82.450% | 0 RPM | <6.0 dB(A) | 0.730 |
| 12.024V | 5.109V | 3.370V | 5.074V | 48.563W | 230.28V | ||||
| 2 | 4.133A | 0.977A | 0.980A | 0.395A | 59.990W | 86.159% | 0 RPM | <6.0 dB(A) | 0.811 |
| 12.024V | 5.107V | 3.369V | 5.072V | 69.627W | 230.27V | ||||
| 3 | 5.370A | 1.469A | 1.472A | 0.592A | 80.029W | 88.484% | 0 RPM | <6.0 dB(A) | 0.860 |
| 12.025V | 5.105V | 3.366V | 5.069V | 90.445W | 230.27V | ||||
| 4 | 6.608A | 1.961A | 1.960A | 0.790A | 100.061W | 89.539% | 0 RPM | <6.0 dB(A) | 0.888 |
| 12.025V | 5.101V | 3.364V | 5.066V | 111.751W | 230.25V | ||||
Efficiency in the 40–100 W load range is quite high.
Ultra-light Load Testing
The applied load in this test is only 10 W for PSUs with 500 W and less capacity. We dial in 2% of the maximum-rated capacity for all other PSUs. We only run this test with 115 V input.| Efficiency at Low Loads - Gigabyte P750GM | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Test # | 12 V | 5 V | 3.3 V | 5 VSB | Power (DC/AC) | Efficiency | Fan Speed | PSU Noise | PF/AC Volts |
| 1 | 1.073A | 0.223A | 0.223A | 0.053A | 15.065W | 54.932% | 0 RPM | <6.0 dB(A) | 0.878 |
| 12.027V | 5.110V | 3.373V | 5.067V | 27.425W | 115.13V | ||||
Gigabyte didn't bother with efficiency at 2% load. ATX asks for over 70% here, and this PSU cannot even exceed 55%.
5VSB Efficiency
| 5VSB Efficiency - Gigabyte P750GM | ||||
|---|---|---|---|---|
| Test # | 5VSB | Power (DC/AC) | Efficiency | PF/AC Volts |
| 1 | 0.100A | 0.506W | 63.014% | 0.035 |
| 5.056V | 0.803W | 230.28V | ||
| 2 | 0.250A | 1.264W | 71.091% | 0.075 |
| 5.053V | 1.778W | 230.27V | ||
| 3 | 0.550A | 2.777W | 76.312% | 0.143 |
| 5.048V | 3.639W | 230.27V | ||
| 4 | 1.000A | 5.041W | 78.276% | 0.220 |
| 5.040V | 6.440W | 230.27V | ||
| 5 | 1.500A | 7.549W | 78.545% | 0.277 |
| 5.032V | 9.611W | 230.27V | ||
| 6 | 3.001A | 15.020W | 80.068% | 0.362 |
| 5.005V | 18.759W | 230.27V | ||
Efficiency of the the 5VSB rail is low.
Power Consumption in Idle and Standby
| Idle / Standby - Gigabyte P750GM | ||||||
|---|---|---|---|---|---|---|
| Mode | 12 V | 5 V | 3.3 V | 5VSB | Power (AC) | PF/AC Volts |
| Idle | 12.021V | 5.112V | 3.374V | 5.059V | 8.323W | 0.280 |
| 230.3V | ||||||
| Standby | 0.159W | 0.007 | ||||
| 230.3V | ||||||
Dec 20th, 2024 21:59 EST
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