Gigabyte UD850GM 850 W Review - No Fireworks

Name: Gigabyte UD850GM 850 W
Brand: GIGABYTE
Price: 140 USD

crmaris

on Jun 6th, 2022,

in Power Supplies.

Manufacturer: GIGABYTE

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.

The platform is efficient, but less so than the updated P850GM, in all load ranges.

10–110 % Load Testing

These tests reveal the PSU's load regulation and efficiency levels under high ambient temperatures and show how the fan-speed profile behaves under harsh operating conditions.

Load Regulation & Efficiency Testing Data - Gigabyte UD850GM
Test	12V	5V	3.3V	5VSB	Power (DC/AC)	Efficiency	Fan Speed	PSU Noise	Temp (In/Out)	PF/AC Volts
10%	5.233A	1.959A	1.946A	0.999A	84.999W	87.52%	0 RPM	<6.0 dB(A)	45.62°C	0.854
10%	12.115V	5.104V	3.391V	5.006V	97.127W	87.52%	0 RPM	<6.0 dB(A)	41.12°C	230.33V
20%	11.478A	2.945A	2.927A	1.201A	169.945W	91.111%	0 RPM	<6.0 dB(A)	46.74°C	0.915
20%	12.113V	5.094V	3.382V	4.995V	186.531W	91.111%	0 RPM	<6.0 dB(A)	41.66°C	230.32V
30%	18.081A	3.442A	3.422A	1.405A	254.953W	92.268%	987 RPM	28.6 dB(A)	42.16°C	0.941
30%	12.107V	5.084V	3.375V	4.984V	276.32W	92.268%	987 RPM	28.6 dB(A)	47.93°C	230.31V
40%	24.706A	3.942A	3.921A	1.609A	340.045W	92.858%	987 RPM	28.6 dB(A)	42.49°C	0.954
40%	12.096V	5.075V	3.367V	4.973V	366.199W	92.858%	987 RPM	28.6 dB(A)	48.62°C	230.3V
50%	30.986A	4.937A	4.913A	1.814A	425.019W	92.85%	988 RPM	28.6 dB(A)	42.99°C	0.963
50%	12.086V	5.065V	3.358V	4.962V	457.748W	92.85%	988 RPM	28.6 dB(A)	49.49°C	230.3V
60%	37.250A	5.936A	5.912A	2.001A	509.488W	92.635%	991 RPM	28.7 dB(A)	43.15°C	0.969
60%	12.074V	5.055V	3.349V	4.95V	549.991W	92.635%	991 RPM	28.7 dB(A)	50.23°C	230.29V
70%	43.583A	6.939A	6.916A	2.228A	594.888W	92.256%	1158 RPM	33.6 dB(A)	43.51°C	0.973
70%	12.064V	5.046V	3.34V	4.938V	644.817W	92.256%	1158 RPM	33.6 dB(A)	51.21°C	230.28V
80%	49.926A	7.946A	7.923A	2.333A	679.719W	91.706%	1720 RPM	41.7 dB(A)	44.29°C	0.976
80%	12.054V	5.036V	3.332V	4.929V	741.195W	91.706%	1720 RPM	41.7 dB(A)	52.66°C	230.26V
90%	56.680A	8.458A	8.423A	2.439A	765.15W	91.212%	2122 RPM	46.1 dB(A)	44.91°C	0.979
90%	12.044V	5.025V	3.324V	4.92V	838.872W	91.212%	2122 RPM	46.1 dB(A)	54.18°C	230.25V
100%	63.183A	8.975A	8.958A	3.062A	849.942W	90.706%	2126 RPM	46.2 dB(A)	45.13°C	0.981
100%	12.033V	5.015V	3.315V	4.9V	937.033W	90.706%	2126 RPM	46.2 dB(A)	55.37°C	230.23V
110%	69.568A	9.992A	10.073A	3.067A	934.544W	90.101%	2131 RPM	46.3 dB(A)	46.57°C	0.983
110%	12.021V	5.004V	3.305V	4.892V	1037.218W	90.101%	2131 RPM	46.3 dB(A)	57.5°C	230.22V
CL1	0.115A	12.398A	12.366A	0A	106.301W	84.685%	0 RPM	<6.0 dB(A)	49.39°C	0.884
CL1	12.120V	5.098V	3.372V	5.011V	125.527W	84.685%	0 RPM	<6.0 dB(A)	42.83°C	230.33V
CL2	0.115A	19.634A	0A	0A	101.395W	83.402%	0 RPM	<6.0 dB(A)	50.75°C	0.88
CL2	12.127V	5.093V	3.367V	5.022V	121.576W	83.402%	0 RPM	<6.0 dB(A)	43.42°C	230.33V
CL3	0.115A	0A	19.616A	0A	67.388W	78.407%	0 RPM	<6.0 dB(A)	52.42°C	0.84
CL3	12.120V	5.079V	3.364V	5.007V	85.944W	78.407%	0 RPM	<6.0 dB(A)	44.31°C	230.34V
CL4	70.593A	0A	0A	0.001A	849.669W	91.372%	2124 RPM	46.1 dB(A)	45.74°C	0.981
CL4	12.036V	5.009V	3.323V	4.978V	929.893W	91.372%	2124 RPM	46.1 dB(A)	55.84°C	230.24V

The PSU survived the tough high temperature tests, but the protection features evaluation tests will tax it even harder. Given the history of Gigabyte PSUs, I have to stress it more than usual to ensure there aren't any problems.

Light-Load Testing

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 when a PC is idle with its power-saving features turned on.

Light Load Efficiency - Gigabyte UD850GM
Test	12V	5V	3.3V	5VSB	Power (DC/AC)	Efficiency	Fan Speed	PSU Noise	Temp (In/Out)	PF/AC Volts
20W	1.240A	0.5A	0.5A	0.2A	20.284W	70.589%	0 RPM	<6.0 dB(A)	40.01°C	0.629
20W	12.115V	5.103V	3.395V	5.03V	28.736W	70.589%	0 RPM	<6.0 dB(A)	36.87°C	230.38V
40W	2.720A	0.7A	0.7A	0.3A	40.384W	80.794%	0 RPM	<6.0 dB(A)	40.81°C	0.752
40W	12.104V	5.102V	3.394V	5.026V	49.985W	80.794%	0 RPM	<6.0 dB(A)	37.47°C	230.38V
60W	4.224A	0.9A	0.9A	0.4A	60.812W	85.389%	0 RPM	<6.0 dB(A)	41.72°C	0.812
60W	12.111V	5.1V	3.393V	5.022V	71.214W	85.389%	0 RPM	<6.0 dB(A)	38.18°C	230.38V
80W	5.704A	1.1A	1.1A	0.5A	80.967W	88.113%	0 RPM	<6.0 dB(A)	43.74°C	0.847
80W	12.117V	5.101V	3.391V	5.017V	91.885W	88.113%	0 RPM	<6.0 dB(A)	39.93°C	230.38V

The cooling fan doesn't spin at light loads despite high operating temperatures.

Super-Light Load Testing

We measure the PSU's efficiency with a 10 W load if its maximum power is 500 W or less in the following tests. If the PSU is stronger, we apply 2% of its maximum-rated-capacity load.

Super-Light Load Efficiency - Gigabyte UD850GM
12V	5V	3.3V	5VSB	Power (DC/AC)	Efficiency	Fan Speed	PSU Noise	Temp (In/Out)	PF/AC Volts
1.240A	0.222A	0.222A	0.053A	17.168W	67.767%	0 RPM	<6.0 dB(A)	30.36°C	0.854
12.108V	5.097V	3.397V	5.034V	25.332W	67.767%	0 RPM	<6.0 dB(A)	28.1°C	115.15V

The PSU exceeds 60% efficiency with 2% load.

5VSB Efficiency

5VSB Efficiency - Gigabyte UD850GM
Test #	5VSB	Power (DC/AC)	Efficiency	PF/AC Volts
1	0.1A	0.504W	63.545%	0.034
1	5.035V	0.793W	63.545%	230.36V
2	0.25A	1.259W	71.607%	0.073
2	5.032V	1.759W	71.607%	230.37V
3	0.55A	2.765W	76.801%	0.14
3	5.026V	3.601W	76.801%	230.37V
4	1A	5.019W	78.616%	0.218
4	5.017V	6.382W	78.616%	230.36V
5	1.5A	7.512W	79.368%	0.278
5	5.007V	9.464W	79.368%	230.36V
6	3A	14.931W	80.407%	0.363
6	4.977V	18.57W	80.407%	230.36V

The 5VSB rail is efficient enough.

Power Consumption in Idle and Standby

Idle / Standby - Gigabyte UD850GM
Mode	12V	5V	3.3V	5VSB	Power (AC)	PF/AC Volts
Idle	12.105V	5.099V	3.4V	5.037V	8.222W	0.288
Idle	12.105V	5.099V	3.4V	5.037V	8.222W	230.37V
Standby					0.154W	0.007
Standby					0.154W	230.37V