Be Quiet! Dark Power Pro 10 650W & 850W PSU Review
by E. Fylladitakis on February 2, 2015 11:40 AM ESTDark Power Pro 10 850W Cold Test Results
Again, for the testing of PSUs, we are using high precision electronic loads with a maximum power draw of 2700 Watts, a Rigol DS5042M 40 MHz oscilloscope, an Extech 380803 power analyzer, two high precision UNI-T UT-325 digital thermometers, an Extech HD600 SPL meter, a self-designed hotbox, and various other bits and parts. For a thorough explanation of our testing methodology and more details on our equipment, please refer to our How We Test PSUs – 2014 Pipeline post.
Being an 80 Plus Platinum certified unit, it is not surprising that the Dark Power Pro 10 850W PSU delivers excellent electrical performance. The average conversion efficiency of the unit within the nominal load range (20% to 100%) is 92.8%, surpassing even the peak efficiency of the less powerful 650W version, while this time the efficiency peaks at 94.5% at 50% load. It performs fairly well under very low loads too, maintaining acceptable efficiency levels with a load down to 60 Watts. With a load of just 5%, the efficiency drops down to 76.9%.
Considering its power output, the Dark Power Pro 10 850W balances thermal performance and acoustics almost perfectly. The cooling fan remains inaudible with a load up to about 400 Watts, at which point it will speed up in parallel with the load to meet with the increasing thermal losses. Even with the PSU at maximum stress however, the SPL levels do not exceed 40.4dB(A), which is a fairly comfortable level for common home and office environments. Considering what sort of components are needed to get up to such a load (e.g. high performance GPUs and a fast CPU), the PSU noise will likely be dwarfed by the noise of the rest of the system.
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maeda_toshiie - Monday, February 2, 2015 - link
"CapXon is a reputable company and their polymer capacitors are among the best worldwide"????? You do know CapXon's reputation and its position in the cap quality rankings...?!
Tator Tot - Monday, February 2, 2015 - link
There's a large difference between Polymer Capacitors & Electrolytic capacitors; CapXon's reputation comes from the quality of their electrolytic capacitors, not their polymers. Polymer capacitors, in general, are pretty hard to mess up though. You'd really have to try to make bad poly's.E.Fyll - Monday, February 2, 2015 - link
Perfectly so. CapXon is one of the ten largest and most reputable companies worldwide. They do have a mediocre reputation, half due to a couple of bad series and half because their products were used in horrible designs, but claiming that they are bad when therea re three dozen worse companies, or trying to suggest that only Japanese companies make good capacitors (in Taiwan), is...not useful.dishayu - Tuesday, February 3, 2015 - link
I can't objectively comment on the quality CapXon capacitors, but i've personally had a poor experience with them in the past and if you google for CapXon you see nothing but criticism and poor reviews. They are very commonly called crapxon on the internet. I don't see how any of that equates to being reputable.4745454b - Tuesday, February 3, 2015 - link
I sort of learned this lesson with my Antec Smart Power 450W. (If you know caps, you know what was in that.) Once I figured out there was a possible problem with my PSU I did what I could to prevent it. I blew the dust out every three months, and kept the tower as a whole as cool as possible. Then I after a year or so I bought a better PSU, the EA500. I don't remember the system it powered back then, probably my E6600 and 7750. My roommate needed a PSU after I upgraded it and I stuck that in there telling her to be gentle with it. Her system was an old P4 with a 9800 I think. (ATI 9800, not Nvidia 9800.) She didn't listen and stuck her case in that sweat box some/most desks come with because "that's where the computer goes right?" Needless to say the PSU didn't last long.The point I'm trying to make is even bad caps can do their job if you are nice to them. And just because a cap doesn't come from X region doesn't mean it's bad.
shadowjk - Friday, February 6, 2015 - link
I'm not familiar with the reputation of individual manufacturers, but even assuming that every capacitor make and model meet their manufacturer's specifications, you can still end up with capacitor death.Capacitors have a defined expected lifetime, at a specific temperature, voltage, and ripple current. The "headline" ratings usually put you in the ballpark of a few thousand hours life expectancy, which is only slightly better than how long a classic light bulb lasts before burning out.
In a poor design, the voltage and temperature limits are usually met by the design, but ripple current spec is exceeded (if we presume the designer aimed for half decent usable life). Temp and V can be checked by average Joe user, ripple current is trickier.
I wonder if the "reputable" jp manufacturers have strings attached to sales, to make sure nobody blows up their capacitors...
extide - Monday, February 2, 2015 - link
Wow, that scope is pretty ancient and crappy! I mean, at least go for the Rigol DS1054Z -- twice the sample rate (max) and tons of features for a really great price.E.Fyll - Monday, February 2, 2015 - link
The scope is old but it is reliable and excels the required specifications....and I want a much better oscilloscope too, but things do tend to be more complicated when you actually have to pay for it.
jordanclock - Monday, February 2, 2015 - link
As someone that isn't particularly well versed in oscilloscopes, would a "better" model make a difference in the results of an Anandtech review? I know you all strive for the highest quality in your reviews, but is this an example of little return on investment?E.Fyll - Monday, February 2, 2015 - link
Not more accurate results on the current tests, but a better oscilloscope would allow for more tests. It will happen eventually but, with a price tag of nearly $9000, it will take a while.