Be Quiet Dark Power Pro P8 1000w Review
Today I'm going to be conducting the testing of the Be Quiet! P8 1000w on OC3D's trusty SunMoon SM-268+ DC load tester. This equipment is capable of placing a user specified load on all of the PSU's rails (+3.3v, +5v, +12v, -12v, +5vSB) up to a maximum load of 1680w. As the maximum load for this device on the +12v rail is restricted to 75A I will also be bringing in our Analogic Series 2000 DC load tester for the 'MAX Load' stage of the testing, so that anything up to an additional 166A can be added if necessary.
As with all of Overclock3D's PSU testing conducted in the past year, all testing of the Be Quiet! Dark Power Pro P8 1000w will be conducted at Sahara-like temperatures of 50°C (±5%) with all results being recorded using a Fluke Digital Multimeter and Thermometer.
Ok, before we get down to discussing the results. Let's get familiar with the graphs. To start with, the highest and lowest values on the Y-axis (voltage) represent the maximum and minimum voltages allowed by ATX specifications. If a line goes off the graph then you can pretty much forget buying it. Luckily the Dark Power Pro maintains reasonable voltage stability throughout, staying extremely close to the ideal voltage (white line) on the +5v and +12v rails while in a 'normal' usage scenario on the green area of the charts.
The orange area indicates cross-load tests, in which the load placed on the PSU is heavily unbalanced (for example an ION based PC running two GTX480's). Of course, this is highly unlikely to be encountered in the real world but once again the Be Quiet has no problems at all dealing with the wonky loads and puts out some rather admirable voltages.
Finally the red area indicates our 'Max Load' test where the PSU is pushed to its absolute limits that are often well outside specifications. In the case of the P8 this was a whopping 1276w - not far off 300w more than the spec on its label. Here the +3.3v rail took a bit of a nosedive down to 3.2v, but the rest of the rails remained very close to their ideas, showing that the unit has some serious grunt.
The efficiency of modern PSU's also plays a large part in many peoples purchase decisions in recent times, and as we already know from the specs back on the introduction page, the P8 is stated as being 80PLUS Silver certified. This means that we should be seeing efficiency levels of at least 85% at 250w and 1000w loads, and 88% at 500w. And do we? YES. The P8 sticks to around 90% efficiency throughout all of the most important tests, only dipping into the 80's during one of the cross-load and max load tests. Of course these tests are not part of the 80PLUS certification procedure, so the unit easily meets its silver certification.
Now let's move on to the next page where you can get a look at the tabulated data along with temperature readings and ripple results...