Be Quiet Dark Power Pro P8 1000w Review
OK, so we've seen the graphs over on the previous page. Now here's the data that they were derived from.
|Be Quiet! P8 1000w Load Results @ 50°C|
|+3.3v||+5.0v||+12v||+5vSB||-12v|| AC Watts / |
|Efficiency|| Intake / |
|5.50A||5.50A||16.75A||1.00A||0.12A||282w / |
|90.42%||50.5°C / |
|11.00A||11.00A||33.50A||2.00A||0.25A|| 350w / |
|91.86%|| 50.1°C / |
|16.50A||16.50A||50.25A||3.00A||0.37A||835w / |
|90.77%||51.0C / |
|22.00A||22.00A||67.00A||4.00A||0.50A||1124w / |
|89.14%|| 49.8°C / |
|22.00A||22.00A||1.00A||0.00A||0.00A||239w / |
|81.17%||49.5°C / |
|1.00A||1.00A||67.00A||0.00A||0.00A||884w / |
|91.62%|| 50.8°C / |
|30.00A||30.00A||85.00A||4.00A||0.50A||1486w / |
|85.86%||48.5°C / |
To reiterate what's already been said over on the previous page, the Dark Power Pro P8 shows excellent voltage stability on the +12v and +5v rails across all loads including the cross-load and max load tests. The +3.3v rail is the only area where the unit is let down a little, but even then the voltages still remain fairly acceptable and well inside ATX specifications.
Another thing I've already mentioned is the results from the 'Max Load' test where the PSU showed that it was capable of holding 1276w continuous. Not only that, but if you look at the load on the +12v rail it held a massive 85A load - plenty enough for any kind of crazy over the top multi-GPU configuration.
Efficiency was also above expectations with the unit sticking to around 90% efficiency through Tests 1-4. Only in the first cross-load test did it drop down to 81%, but this is quite common for most PSU's when a heavy load is placed on the +3.3v & +5v rails with little on the +12v rails
|Be Quiet! P8 1000w Scope Results @ 50c |
EEK! No I didn't mix up the results from the +12v rail with those from a Seismograph in the middle of an earthquake! But yes, the ripple on the +12v rail is less than ideal with the results climing from 50mV in Test 1 to a maximum of 136mV in Test 4. Considering that ATX specifications state that ripple on this rail should be no more than 120mV it looks like Be Quiet have some work to do here. Of course, these levels aren't exactly dangerous - for example I've seen other well known brands hit over 250mV, but there are still plenty of other brands on the market that do a much better job.
The +3.3v and +5v rails on the other hand were quite acceptable, with the closest call being the +3.3v rail in Test 4 that came within 8mV of ATX's recommended 50mV limit.
Now let's try and form some kind of conclusion...