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Be Quiet! Dark Power Pro 10 850W Power Supply Review

Manufacturer: Be Quiet!

DC Load Regulation and AC Ripple

DC Output Load Regulation

To simulate real world and maximum loading conditions, the Dark Power Pro 10 850W PSU was connected to the load testers and supplied with a constant 115 VAC.  In this test we are interested in seeing how well a PSU can maintain the various output voltages while operating under different loads. 

The ATX12V V2.2 tolerance for voltages states how much each output (rail) is allowed to fluctuate and has tighter tolerances now for the +12V outputs.  I have also included a second table of expanded tolerances (±1% to ±6%) for reference.

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The following tables list the DC voltage results for the PSU while operating on 115 VAC, 60 Hz.

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As you can see, the Dark Power Pro 10 850W PSU produced outstanding load regulation on all of the outputs across a broad range of loads.  The Be Quiet! version is a good example of a Seasonic X-Series power supply at its best.   

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AC Ripple and Noise on the DC Outputs

The amount of AC ripple and noise present on the DC outputs was checked using a digital oscilloscope.  This AC component may be present in the KHz range where most switching power supplies operate or it may be more prevalent at the 60 Hz line frequency.  We adjust the O-scope time base to look for AC ripple at both low and high frequencies.  The ATX12V V2.2 specification for DC output noise/ripple is defined in the ATX12V Power Supply Design Guide.

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Ideally we would like to see no AC ripple (repetitive) or noise (random) on the DC outputs – the cleaner the better!  But in reality there will always be some present.  I measured the amplitude of the AC signal (in millivolts, peak-to-peak) to see how well the power supply complied with the ATX standard.  The following table lists the ripple/noise results during all of the load tests for the main output voltages of interest.

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The Dark Power Pro 10 850W power supply also exhibited excellent AC ripple suppression on all of the primary outputs and stayed well below the recommended values, even at full load.
 

June 17, 2013 | 12:10 AM - Posted by Anonymous (not verified)

Just got my Dark Power P10 1200W and it's the most awesome PSU i've ever seen!

June 17, 2013 | 01:19 PM - Posted by Anonymous (not verified)

Seen ? But how does it work ?

June 17, 2013 | 01:22 PM - Posted by Anonymous (not verified)

70A on the 12V rail...yikes !
Wish I could go into that C7 sleep state...I`d feel more rested upon awakening.

June 18, 2013 | 08:43 AM - Posted by pdjblum

Lee,

Another amazing psu review and another amazing psu from seasonic made even better by Be Quiet.

Two questions: In what situation would the multi 12v rails be chosen over the single rail? I have always used single rail psu's beginning back with pc power and cooling years and years ago.

The second question is about the fluid dynamic verse double ball bearing. Is one better than the other?

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