Be Quiet! Dark Power Pro 650w ATX PSU

Test Results

Load Testing

To provide our readers with the most accurate results, Overclock3D uses a custom built PSU load tester on all reviews. This not only gives much more reliable results than the testing methods employed by other sites, but also allows for all current and future review results to be compared side-by-side. The following table shows the load (in watts) that was applied to the Dark Power PRO 650w during testing.
   0%  50%  100%
 +3.3v Rail  0w  33w  66w
 +5.0v Rail  0w  100w  150w
 +12v Rail(s)  0w  200w  400w
 Total  0w  333w  616w
Be Quiet! Dark Power PRO Load Test
A common practice among some manufacturers is to "over-volt" the rails on their PSU's. This often leads end-users to believe that they have purchased a high quality PSU just because it can maintain voltages above the rated outputs (3.33v, 5.00v & 12.00v), when in reality the manufacturer has simply set the idle voltages as high as possible just to compensate for fluctuation under load.
From the graphs above, it is clear to see that Be Quiet! is not one of this companies. With idle voltages almost exactly on their ideal levels across and very little fluctuation under full load, the Dark Power PRO performs just how a high quality PSU should.
Efficiency Results
Efficiency tests are performed by measuring the wattage consumed by the power supply at the mains (Mains Draw) against the power consumed by the OC3D power supply stress tester (PSU Load). These results may not be 100% accurate, but have proven to be extremely close to results obtained from professional equipment.
Be Quiet! Dark Power PRO Efficiency
As we can see from the upward slant of the line graph above, the efficiency of the Dark Power PRO improves as the load increases. Be Quiet! state that the unit is able to deliver up to 88% efficiency, and the results obtained from our own tests certainly suggest that is able to come extremely close to that figure.

Temperature vs Fan Speed
As with all components in the modern computer system, the performance of a PSU can be directly affected by heat. Excess heat inside the PSU can easily have a negative effect of the maximum power output of the unit and lead to voltage instability. For this reason, Overclock3D includes temperature recordings taken from the PSU's exhaust using a thermal probe to highlight any potential issues that the PSU might have obtaining its rated output.
Be Quiet! Temperature vs Fan
Under normal circumstances we'd also use a sound meter to record the dBA noise level output by the fan. However, the Dark Power PRO was so damn quiet it was simply impossible to take a reading from the PSU without the low-level ambient noise affecting the results. Even with the voltage of the cooling fan inside the unit ramping up from 4.66v to 10.97v at full load, the unit was barely audible. I can say without a shadow of doubt in my mind that this is one of, if not THE most silent PSU ever tested here at Overclock3D.
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Most Recent Comments

01-05-2008, 06:54:57

Seriously sexy PSU, i'm sure people who actually care what their PSU looks like MIGHT be able to stretch to that price... but not me Quote

01-05-2008, 07:14:38

Great review.

Those people definately have some relation of sorts with Silentpower. I have a 400W psu at home with embossing in the same place, same coating with color (might be a little darker grey) and shine, and the fan-guard looks identical if not the same. Not modular tho. Maybe use the same casing manufs or something.

Seems a decent psu, for close to £100 it would have to be very solid with it`s power quality. Also u can barely hear it - what a bonus.Quote

01-05-2008, 11:35:31

that does sound good () for media junkies and people who want HTPC's Quote

06-09-2008, 11:42:17

Thinking of buying this psu as i like the cable setup,was going to ask about 8 pin videocard cable but it has it Quote

06-09-2008, 19:15:13

So we're accomplishment to jazz to appear at shipway to use the raiseable design to compound their 'Experience of Warcraft' live. We'll see guild wars gold what merciful of applications we can amount up with."Quote

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