BeQuiet Dark Power Pro P10 850w Review @ KitGuru

[Tator Tot]

That's not an adjusted value and they don't tell us what the room's ambient noise level is. Most likely somewhere in the 30-35dB range, given the figures.

Like wise, they're not isolating the PSU but going off of the whole system.

Still, if you notice, the BeQuiet unit is the quietest out of all of the units presented. Even Enermax's platinum offering which is more efficient.

[Stefan Payne]

Originally Posted by crmaris

Actually from 20% load with 41.5C ambient the fan is well audible but from 50% test and above the fan is loud. It makes me wonder how Kitguru missed this!

Maybe by not testing the fan with 41.5°C Ambient?
Wich is a little over the spec, AFAIR

Originally Posted by webdigo

Tator Tot: Are you sure the 650w would be suitable? I've borrowed highend watt measuring gear from the electricity company here in my country. And in heaven DX11 + prime95 at the same time, I maxed out at around 560w. I thought an 850w would be good for me, if my concern is noise. But maybe even the BeQuiet P10 750 (FSP) is still overkill?

Yeah, absolutely.
As 560W primary is far less at the other side. If we assume 89% Efficienc, that equals about 500W secondary.
So the 550W P10 is the best fitting option for your rig.

Originally Posted by Tator Tot

All Platimax units range from 21dB to 30dB (according to Enermax) depending on rotational speed of the fan. So not /as/ good as BeQuiet's offerings.

P10 750w is 22.6dB at full load according to BeQuiet.

Well, you can't really compare those readings as you don't know how they 'tested'...

Originally Posted by webdigo

so even a BeQuiet P10 750w, is still overkill?

Yes, by far.

Originally Posted by Tator Tot

BeQuiet is one of the few companies that does try to pay attention to coil-whine with a deep regard but unfortunately, lemons happen and sometimes things can go wrong in shipping.

Not only that, they also use a fan only for a few models! So there is not just one fan per series (or in general), they use normally 3 or 4 different speedgrades for their power supplys...

[crmaris]

From the most recent ATX spec.

Sound power determination is to be performed at 43 C, at 50% of the maximum rated
load, at sea level. This test point is chosen to represent the environment seen inside a
typical system at the idle acoustic test condition, with the 43 C being derived from the
standard ambient assumption of 23 C, with 20 C added for the temperature rise within
the system (what is typically seen by the inlet fan). The declared sound power shall be
measured according to ISO 7779 and reported according to ISO 9296.


ALSO

Temperature - RECOMMENDED

Operating ambient +10 °C to +50 °C (At full load, with a maximum temperature
rate of change of 5 °C/10 minutes, but no more than 10 °C/hr.)

[Philipus II]

Hi, I'm one of the two PSU guys at the German site tech-review.de.

For the interpretation of our noise testing:
a) Never compare our figures to other sites. Our measurement doesn't comply to any standards. But we do the testing the same way with every PSU, so as long as you look at the listed competitors in our diagramm our results are valid.
Switching to a distance of 1 meter isn't an option, because our equipment wouldn't allow us usefull results. So we do our testing at very close range.

b) The sound level of our P10 @ load was perfect. Using low loads, some other PSUs are more silent. Ok, the difference is very little, but we are German and we really care about noise.
Units like the Seasonic S12II are considered very loud here.

c) We don't have to isolate the PSU from the system, because we disable the fans for some seconds. Instead of an HDD Louis Hirschmann bought a SSD for his test setup, too. We isolate the graphics card, because his HD 4870 has the coil whining problem.

Feel free to ask questions

[Christoph®]

Originally Posted by webdigo

ok...having tested it for 1 day straight with heavy games and simple idle.

Everything about the unit and misc, are just high quaility. However this it where it stops for me

My sample has a ridiculously amount of coilwhine. It was so much, that I could hear it clearly, even tho my pc-case is completely noise isolated.

I think P10 series are great units. And I can only assume I have been very unlucky.
I was really hoping my search was gone. But I have no other choise, than to send my sample back to the dealer.

I really don't know if I should get a 2nd P10 850w. The shipping across from my country to the closest dealer (other country), is really expensive, 30 euro.

Hi!
This is really strange, even though your system needs much less power it should have not make electrical noises. Did you RMA the unit already? I would like to get it back to me here. If there is any chance please let me know. Did you already buy a 550W?

Looking forward to hear from you,

Chris

[jonnyGURU]

I've got a P10 850W in the queue and I will tell you there was absolutely no electrical noise at all. If you have one making a whining noise, and you're sure the noise is coming from the power supply, then you have a defective unit.

[webdigo]

Originally Posted by Christoph®

Hi!
This is really strange, even though your system needs much less power it should have not make electrical noises. Did you RMA the unit already? I would like to get it back to me here. If there is any chance please let me know. Did you already buy a 550W?

Looking forward to hear from you,

Chris

Hi Chris. I'm sending the PSU back to the dealer tomorrow, assuming this is where I need to send it to. So theres still time I ship to you, leaving the dealer out of this.
And then my plan was to buy the P10 550w.

[webdigo]

Originally Posted by jonnyGURU

I've got a P10 850W in the queue and I will tell you there was absolutely no electrical noise at all. If you have one making a whining noise, and you're sure the noise is coming from the power supply, then you have a defective unit.

I am very much sure it came from the unit itself. because when I plugged in my old PSU, there were no such noise to track at all.

[Christoph®]

Originally Posted by webdigo

Hi Chris. I'm sending the PSU back to the dealer tomorrow, assuming this is where I need to send it to. So theres still time I ship to you, leaving the dealer out of this.
And then my plan was to buy the P10 550w.

Hi, alright let me know how it turns out. You know that Webhallen just opened a branch in Denmark. You can buy the Dark Powers there by the end of the week actually.

Chris