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be quiet! Pure Power 11 700W PSU Review

To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units.

Primary Rails And 5VSB Load Regulation

Load Regulation testing is detailed here.

Hold-Up Time

Our hold-up time tests are described in detail here.

The oscilloscope screenshots that we took during the hold-up time measurements:

The hold-up time is long, something that we expected because of the ACRF topology, and the power ok signal is accurate.

Inrush Current

For details on our inrush current testing, please click here.

We measure very high inrush currents, with both voltage inputs. The NTC thermistor, responsible for lowering those currents, is small and on top of that it is not supported by a bypass relay, so it gets hot soon and its resistance drops.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the L11-CM-700’s efficiency. The applied load equals (approximately) 10 to 110 percent of the power supplies maximum load in increments of 10 percentage points.

We conducted two additional tests.

During the first, we stressed the two minor rails (5V and 3.3V) with a high load, while the load at +12V was only 0.1A. This test reveals whether a power supply is compatible with Intel’s C6/C7 sleep states or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.

Test # 12V 5V 3.3V 5VSB DC/AC (Watts) Efficiency Fan Speed (RPM) PSU Noise (dB[A]) Temps (In/Out) PF/AC Volts
1 3.971A 1.990A 1.948A 0.985A 69.651 86.337% 685 12.5 40.04°C 0.915
12.101V 5.026V 3.386V 5.077V 80.673 44.95°C 115.05V
2 9.002A 2.991A 2.933A 1.185A 139.723 90.135% 687 12.1 40.45°C 0.948
12.088V 5.017V 3.375V 5.064V 155.015 45.72°C 115.05V
3 14.378A 3.495A 3.415A 1.386A 209.635 91.060% 687 12.1 41.26°C 0.968
12.076V 5.009V 3.367V 5.052V 230.217 46.74°C 115.05V
4 19.764A 4.003A 3.932A 1.588A 279.657 91.198% 689 11.2 41.88°C 0.979
12.065V 4.997V 3.357V 5.038V 306.649 47.84°C 115.04V
5 24.829A 5.013A 4.928A 1.791A 349.737 90.811% 692 11.1 42.54°C 0.987
12.052V 4.988V 3.347V 5.024V 385.125 48.86°C 115.04V
6 29.908A 6.027A 5.934A 1.996A 419.850 90.217% 693 10.9 42.97°C 0.991
12.039V 4.977V 3.335V 5.011V 465.380 50.52°C 115.04V
7 34.993A 7.052A 6.956A 2.202A 489.979 89.479% 789 14.0 43.22°C 0.992
12.027V 4.964V 3.322V 4.997V 547.594 52.08°C 115.03V
8 40.096A 8.081A 7.984A 2.409A 560.070 88.639% 1047 19.1 43.89°C 0.993
12.013V 4.950V 3.306V 4.982V 631.853 53.30°C 115.03V
9 45.607A 8.606A 8.497A 2.414A 629.791 87.761% 1270 25.1 44.55°C 0.994
12.000V 4.939V 3.295V 4.973V 717.623 54.54°C 115.03V
10 50.897A 9.137A 9.053A 3.031A 699.814 86.678% 1476 29.4 45.19°C 0.995
11.987V 4.926V 3.281V 4.949V 807.369 56.29°C 115.03V
11 56.801A 9.156A 9.081A 3.037A 769.846 85.389% 1712 33.5 46.98°C 0.993
11.974V 4.916V 3.270V 4.941V 901.578 58.52°C 115.02V
CL1 0.139A 18.004A 18.000A 0.000A 151.169 82.350% 906 17.7 42.94°C 0.958
12.068V 4.967V 3.337V 5.063V 183.568 48.88°C 115.05V
CL2 56.005A 1.002A 1.001A 1.000A 685.276 86.822% 1496 29.9 45.73°C 0.994
11.999V 4.949V 3.300V 5.009V 789.287 56.46°C 115.03V

The load regulation at +12V cannot compete with units that feature half or full-bridge topologies, however still it is within 1% so it is satisfactory. The voltage deviations on the rest rails are notable, under increased loads.

The registered efficiency levels meet the corresponding 80 PLUS Gold requirements with 20% and 50% of the unit’s max-rated load, while with full load efficiency cannot reach 87%. Nonetheless, we apply a huge stress with an over 45°C ambient, so inevitably the PSU’s efficiency takes a big hit.

Despite of the 40°C rating, we cranked up the heat inside the hotbox at up to 47°C and everything went smooth. Even under very tough conditions the cooling fan spins at low speeds, with the output noise remaining at equally low levels.

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