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Deepcool Gamer Storm DQ850-M 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 bulk cap’s capacity is not high enough to offer a longer than 17ms hold-up time and this is a great shame. At least the power ok signal is accurate, however it is much lower than 16ms that the ATX spec requires.

Inrush Current

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

The registered inrush current with both 115V and 230V input is at normal levels for this wattage.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the DQ850-M’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 5.270A 1.983A 1.962A 0.986A 84.836 87.613% 752 18.7 40.02°C 0.966
12.001V 5.044V 3.359V 5.070V 96.830 43.67°C 115.12V
2 11.546A 2.976A 2.946A 1.185A 169.339 90.793% 757 18.7 40.27°C 0.981
11.991V 5.041V 3.357V 5.062V 186.511 44.22°C 115.11V
3 18.235A 3.475A 3.426A 1.385A 254.477 91.472% 760 18.8 41.21°C 0.983
11.981V 5.038V 3.355V 5.056V 278.201 45.47°C 115.11V
4 24.930A 3.973A 3.936A 1.585A 339.675 91.416% 755 18.7 41.75°C 0.981
11.972V 5.036V 3.354V 5.050V 371.569 46.21°C 115.11V
5 31.310A 4.968A 4.923A 1.785A 425.005 90.910% 757 18.7 42.21°C 0.980
11.961V 5.033V 3.352V 5.042V 467.500 47.29°C 115.11V
6 37.630A 5.963A 5.911A 1.986A 509.517 89.698% 757 18.7 42.77°C 0.981
11.951V 5.031V 3.350V 5.035V 568.039 48.24°C 115.11V
7 44.034A 6.962A 6.899A 2.188A 594.867 88.809% 1200 28.2 43.83°C 0.983
11.940V 5.028V 3.348V 5.027V 669.828 49.66°C 115.23V
8 50.449A 7.961A 7.889A 2.391A 680.216 87.916% 1655 37.1 44.34°C 0.984
11.929V 5.026V 3.346V 5.019V 773.708 50.45°C 115.14V
9 57.278A 8.463A 8.375A 2.392A 765.155 87.129% 1743 40.9 45.20°C 0.986
11.918V 5.023V 3.344V 5.017V 878.183 51.82°C 115.29V
10 64.052A 8.965A 8.885A 2.495A 849.876 86.254% 1743 40.9 45.38°C 0.987
11.907V 5.021V 3.342V 5.011V 985.319 52.78°C 115.15V
11 71.227A 8.970A 8.891A 2.496A 934.678 85.234% 1743 40.9 46.58°C 0.988
11.898V 5.018V 3.341V 5.009V 1096.597 54.30°C 115.14V
CL1 0.148A 14.001A 14.001A 0.000A 119.102 83.836% 777 19.1 42.71°C 0.977
11.986V 5.034V 3.346V 5.080V 142.065 47.83°C 115.13V
CL2 70.836A 1.002A 1.000A 1.000A 857.727 86.944% 1750 40.9 45.30°C 0.987
11.919V 5.022V 3.351V 5.049V 986.525 52.41°C 115.21V

There is no passive operation at light loads, however the fan profile is quite relaxed. It needs 80% of the unit’s max rated load and over 44°C to push the fan high speeds and even in the worst case scenario the PSU’s noise is at 41 dB(A).

The load regulation at +12V is tight enough, however it cannot compete against the performance of Seasonic’s Focus platform. On the 5V and 3.3V rails the deviations are low as well and at 5VSB the load regulation is among the best in this category.

This platform easily meets the 80 PLUS Gold requirements with 20% and 50% load, even under high operating temperatures. It falls short with full load, however we apply almost 23°C more than what the 80 PLUS uses for its evaluations, and the higher the operating temperature the more the impact on a PSU’s efficiency.

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