be quiet! Pure Power 11 FM 650 W Review - Kill the Noise

Name: be quiet! Pure Power 11 FM 650 W
Brand: be quiet!
Price: 125 USD

crmaris

on May 11th, 2021,

in Power Supplies.

Manufacturer: be quiet!

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.

Efficiency is high in all regions but 40–100 W.

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 - be quiet! Pure Power 11 FM 650W
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	3.590A	1.982A	1.996A	0.996A	64.957W	85.130%	498 RPM	<6.0 dB(A)	40.02°C	0.816
10% Load	12.076V	5.044V	3.309V	5.023V	76.303W	85.130%	498 RPM	<6.0 dB(A)	44.18°C	230.33V
20% Load	8.168A	2.975A	2.994A	1.196A	130.015W	90.008%	501 RPM	<6.0 dB(A)	40.87°C	0.928
20% Load	12.134V	5.043V	3.307V	5.018V	144.449W	90.008%	501 RPM	<6.0 dB(A)	45.67°C	230.30V
30% Load	13.107A	3.472A	3.495A	1.397A	195.017W	92.505%	503 RPM	<6.0 dB(A)	41.06°C	0.960
30% Load	12.128V	5.041V	3.305V	5.012V	210.817W	92.505%	503 RPM	<6.0 dB(A)	46.64°C	230.29V
40% Load	18.065A	3.970A	3.994A	1.598A	260.021W	92.989%	504 RPM	<6.0 dB(A)	41.35°C	0.974
40% Load	12.113V	5.039V	3.304V	5.006V	279.627W	92.989%	504 RPM	<6.0 dB(A)	47.77°C	230.27V
50% Load	22.701A	4.963A	4.997A	1.800A	325.056W	92.881%	505 RPM	<6.0 dB(A)	41.98°C	0.981
50% Load	12.094V	5.038V	3.303V	5.001V	349.971W	92.881%	505 RPM	<6.0 dB(A)	48.82°C	230.28V
60% Load	27.293A	5.959A	6.000A	2.000A	389.450W	92.532%	792 RPM	15.7 dB(A)	42.46°C	0.985
60% Load	12.078V	5.036V	3.301V	4.995V	420.881W	92.532%	792 RPM	15.7 dB(A)	50.30°C	230.28V
70% Load	31.965A	6.954A	7.005A	2.205A	454.816W	92.185%	1102 RPM	25.8 dB(A)	42.97°C	0.987
70% Load	12.066V	5.035V	3.299V	4.990V	493.375W	92.185%	1102 RPM	25.8 dB(A)	51.52°C	230.29V
80% Load	36.607A	7.951A	8.005A	2.408A	520.120W	91.795%	1328 RPM	31.3 dB(A)	43.46°C	0.989
80% Load	12.066V	5.033V	3.298V	4.984V	566.613W	91.795%	1328 RPM	31.3 dB(A)	52.59°C	230.30V
90% Load	41.639A	8.449A	8.493A	2.409A	585.044W	91.399%	1674 RPM	37.8 dB(A)	44.38°C	0.990
90% Load	12.069V	5.031V	3.296V	4.982V	640.098W	91.399%	1674 RPM	37.8 dB(A)	53.83°C	230.31V
100% Load	46.417A	8.948A	9.010A	3.021A	649.813W	90.990%	1691 RPM	38.5 dB(A)	45.86°C	0.991
100% Load	12.067V	5.029V	3.296V	4.966V	714.156W	90.990%	1691 RPM	38.5 dB(A)	56.18°C	230.30V
110% Load	51.787A	8.952A	9.015A	3.022A	714.718W	90.628%	1690 RPM	38.5 dB(A)	46.71°C	0.992
110% Load	12.069V	5.027V	3.294V	4.965V	788.629W	90.628%	1690 RPM	38.5 dB(A)	57.48°C	230.33V
Crossload 1	0.115A	14.002A	14.001A	0.000A	118.127W	83.790%	948 RPM	20.9 dB(A)	41.95°C	0.926
Crossload 1	12.133V	5.042V	3.295V	5.059V	140.979W	83.790%	948 RPM	20.9 dB(A)	48.97°C	230.35V
Crossload 2	54.182A	1.000A	0.998A	1.000A	667.525W	91.576%	1686 RPM	38.1 dB(A)	45.72°C	0.991
Crossload 2	12.074V	5.029V	3.300V	5.009V	728.929W	91.576%	1686 RPM	38.1 dB(A)	55.95°C	230.32V

The PSU can handle high operating temperatures without being noisy since the fan spins at low speeds under harsh conditions.

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

Efficiency at Low Loads - be quiet! Pure Power 11 FM 650W
Test #	12 V	5 V	3.3 V	5 VSB	Power (DC/AC)	Efficiency	Fan Speed	PSU Noise	PF/AC Volts
1	2.897A	0.496A	0.498A	0.198A	40.025W	84.240%	489 RPM	<6.0 dB(A)	0.670
1	12.039V	5.043V	3.310V	5.040V	47.513W	84.240%	489 RPM	<6.0 dB(A)	230.32V
2	4.120A	0.992A	0.997A	0.397A	59.974W	84.951%	492 RPM	<6.0 dB(A)	0.794
2	12.056V	5.044V	3.311V	5.037V	70.598W	84.951%	492 RPM	<6.0 dB(A)	230.32V
3	5.332A	1.485A	1.495A	0.596A	80.002W	86.584%	494 RPM	<6.0 dB(A)	0.860
3	12.109V	5.043V	3.310V	5.032V	92.398W	86.584%	494 RPM	<6.0 dB(A)	230.30V
4	6.543A	1.982A	1.993A	0.796A	100.036W	86.811%	498 RPM	<6.0 dB(A)	0.899
4	12.142V	5.043V	3.309V	5.027V	115.234W	86.811%	498 RPM	<6.0 dB(A)	230.30V

Efficiency levels are high with light loads, and the PSU is silent despite ambient temperatures of over 35 °C.

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 and only run this test with 115 V input.

Efficiency at Low Loads - be quiet! Pure Power 11 FM 650W
Test #	12 V	5 V	3.3 V	5 VSB	Power (DC/AC)	Efficiency	Fan Speed	PSU Noise	PF/AC Volts
1	0.896A	0.238A	0.240A	0.050A	13.011W	71.820%	430 RPM	<6.0 dB(A)	0.736
1	12.014V	5.040V	3.314V	5.041V	18.116W	71.820%	430 RPM	<6.0 dB(A)	115.16V

The PSU easily breaks the 70% mark with 2% load.

5VSB Efficiency

5VSB Efficiency - be quiet! Pure Power 11 FM 650W
Test #	5VSB	Power (DC/AC)	Efficiency	PF/AC Volts
1	0.100A	0.501W	71.368%	0.022
1	5.011V	0.702W	71.368%	230.29V
2	0.250A	1.252W	75.879%	0.049
2	5.008V	1.650W	75.879%	230.29V
3	0.550A	2.752W	77.521%	0.103
3	5.003V	3.550W	77.521%	230.29V
4	1.000A	4.997W	78.842%	0.171
4	4.996V	6.338W	78.842%	230.29V
5	1.500A	7.483W	79.294%	0.232
5	4.987V	9.437W	79.294%	230.29V
6	3.001A	14.884W	79.619%	0.343
6	4.960V	18.694W	79.619%	230.30V

The 5VSB rail is efficient.

Power Consumption in Idle and Standby

Idle / Standby - be quiet! Pure Power 11 FM 650W
Mode	12 V	5 V	3.3 V	5VSB	Power (AC)	PF/AC Volts
Idle	12.007V	5.040V	3.315V	5.041V	2.117W	0.061
Idle	12.007V	5.040V	3.315V	5.041V	2.117W	230.4V
Standby					0.0405W	0.060
Standby					0.0405W	230.4V