Overclock.net › Forums › Cooling › Air Cooling › be quiet! Dark Rock Pro 3
New Posts  All Forums:Forum Nav:

be quiet! Dark Rock Pro 3 - Page 39

post #381 of 506
So my 135 mm SW fan on the DRP3 is a bit weird. It runs at a reported ~1900 RPM and not 1500 that it is rated at, and has a very different PWM duty cycle compared to the 120 mm fan that also comes with the cooler. On the same PWM signal, there is a huge difference in airflow and fan speeds thus which is not going to do well for the sound signature. Anyone else have this issue?

LEAD Technologies Inc. V1.01

I used multiple PWM controllers to be sure, and it was the same each time.
post #382 of 506
No one? biggrin.gif

I got an unconvincing response from be quiet! so I am inclined to not add anything to the review about this till something concrete comes up. That's why I was hoping others would share their experiences.
post #383 of 506
Thread Starter 
Quote:
Originally Posted by geggeg View Post

No one? biggrin.gif

I got an unconvincing response from be quiet! so I am inclined to not add anything to the review about this till something concrete comes up. That's why I was hoping others would share their experiences.

If I get a chance to grab mine out of my storage unit this weekend I can check the fan speeds for you. No promises, though.....
post #384 of 506
This is what I get from the 120mm fan, and as you can see that 40% for the 135mm is about 500rpm
post #385 of 506
Quote:
Originally Posted by ciarlatano View Post

If I get a chance to grab mine out of my storage unit this weekend I can check the fan speeds for you. No promises, though.....

Please don't trouble yourself, it's not that big a deal to get you to go do all that.
Quote:
Originally Posted by vicyo View Post

This is what I get from the 120mm fan, and as you can see that 40% for the 135mm is about 500rpm

Are you controlling the 135 mm fan separately?
post #386 of 506
Thread Starter 
Quote:
Originally Posted by vicyo View Post

This is what I get from the 120mm fan, and as you can see that 40% for the 135mm is about 500rpm

It's refreshing to see someone using Thermal Radar correctly. Very powerful program if you use it correctly. One of the biggest reasons for my Sabertooth love. biggrin.gif
post #387 of 506
Quote:
Originally Posted by geggeg View Post

Are you controlling the 135 mm fan separately?
No, the 135 is connected to the cpu_opt header, it shares the same PWM output as the cpu_fan (the one with the 120mm fan), but I still can get the rpm readings from it

Quote:
Originally Posted by ciarlatano View Post

It's refreshing to see someone using Thermal Radar correctly. Very powerful program if you use it correctly. One of the biggest reasons for my Sabertooth love. biggrin.gif
Its a great program, but it have some major flaws I wish asus fixed. I had to manualy edit the standard profile files so I would not constantly loose my settings, and the refresh rate is just abysmal, making it useless when controlling the fan automaticaly 99.99% of the time T.T
post #388 of 506
Quote:
Originally Posted by vicyo View Post

No, the 135 is connected to the cpu_opt header, it shares the same PWM output as the cpu_fan (the one with the 120mm fan), but I still can get the rpm readings from it
Its a great program, but it have some major flaws I wish asus fixed. I had to manualy edit the standard profile files so I would not constantly loose my settings, and the refresh rate is just abysmal, making it useless when controlling the fan automaticaly 99.99% of the time T.T

Ah ok, that explains everything in that picture now. I don't suppose I could bother you to see what the CPU_OPT header reported at 100%? Thanks again for the info +1
post #389 of 506
Quote:
Originally Posted by geggeg View Post

Ah ok, that explains everything in that picture now. I don't suppose I could bother you to see what the CPU_OPT header reported at 100%? Thanks again for the info +1
About 2000~2100rpm and holy S-word, its way off what bequiet specifications says handlebarssmiley.png


Those fans are a mystery as the motherboard can easily slow the 120mm ones to about 450rpm .-.
Edited by vicyo - 7/22/16 at 1:54pm
post #390 of 506
Ok so let me say here what be quiet! told me, so there is nothing off the table. They said that given the 135 mm fan uses a 6-pole motor, the fan header measures 6 steps for fan RPM instead of the usual 4 aka giving a 1.5x readout to the actual RPM. As such, divide that 2112 by 1.5 and you get 1408 RPM which is in line with specs.

My problem is that the 120 mm fan is also using a 6-pole motor, and I have measured their retail 120 and 140mm SW fans that claim to use the same thing and I never saw anything like this. That aside, and I quote another thermal engineer here, "Typically the tach signal is generated by a sensor on the PCB when the magnet rotates above it, the pole of the magnet triggers the sensor. North to one rail and south to the other rail. Thus a nice square wave. Every six pole motor I've ever used was four pulses per revolution. The magnet itself is so only two poles after all." As such, I am not convinced by that explanation just yet. Even assuming it is true, my 135 mm fan is then spinning at ~1200 RPM which is also well off spec.

The best way to be sure is to get a laser/non-contact tachometer but I don't want to spend another ~$150 out of my own pocket for a reliable instrument I will rarely use.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Air Cooling
Overclock.net › Forums › Cooling › Air Cooling › be quiet! Dark Rock Pro 3