Fan Speed Advice

[JamesEnquiry]

Hello,
I'm looking for an advice about cooling and fan speeds.

I've recently build a new PC. It consists of
i7 6700K cooled by CoolerMaster Hyper 212X
16 GB Kinstgston HyperX RAM running at 2666 MHz
all on a Gigabyte Z170X Gaming 3
seated in a Fractal Design Define R4 with 2 front intake and one exhaust 140mm Noctua PWM fans
HDD cage is removed for a better airflow and the cable management could be considered decent

So far it has been running only using the onboard Intel GPU, until my pre-ordered GTX 1070 is available. In BIOS the chassis fans are set to normal and are of course plugged into the motherobard. So all fans are controled by the MoBo/CPU.

Now, I haven't reached higher temps than some 45C/113F even at 4000Mhz or at one core turboboosted 4200. Mind you the room temps reached some 27C today. So I'd consider that ok.
I have been using CPU-ID HW monitor and Win10 for my readings.

What I find slightly odd is the fact that it shows the CPU fan spinning at around 1600-1700 RPM while all the chassis fans never exceed some 950. Is that a normal behavior?

I'm genuinly puzzled by this. In my previous rig I had my chassis fans connected to a manual controller and I had them spinning at higher RPMs most of the time so this never came up, also different CPU and such.

Thanks a lot for your input!

 

[Bearmann]

It could be an erroneous reading. Does the CPU fan seem like it is spinning that fast? It should be a bit loud at that speed. Does it give a similar reading in the UEFI? The CPU fan is a PWM fan plugged into the CPU header? You might want to try a different software program and see if it gives the same reading. I would check the Gigabyte forums regarding that particular MB. Gigabyte is known to have some issues with their fan control.

 

[Paperdoc]

Check the CD that came with your mobo. Look for a utility called System Information Viewer that is mentioned in your mobo's manual in the section about fan control. Install that utility (unless it is already installed) and run it as an application under Windows. It can show you your fan speeds, and because it is provided by the mobo maker it is VERY likely to tell you the true speeds.

You need to understand how automatic fan speed control in your system works. It is not anything like what you did before with manual control by YOU. Your new system actually is running two TEMPERATURE control systems - one for the CPU, and another for the mobo and case. In each of these there is a temperature sensor. One is inside the CPU chip and sends its signal out to the mobo on one chip pin. The other sensor is built into the mobo by its maker and located where that maker decided is the best spot. In each case, the mobo automatic system checks that current actual measured temperature against the target that it has been pre-set to use for the hardware you have installed. It works to keep the measured temperatures close to the targets for each of the two control systems. It does this by manipulating the speed of the relevant fan (CPU fan or case fan(s)) to achieve the required cooling air flow and thus the temperatures at those two sensors.

The CPU and the mobo components generate heat at very different rates, and are designed for different ideal operating temperatures, so it is NORMAL for the CPU fan and the case ventilation fans to operate at different speeds. Remember, the two automatic systems are not aiming for specific speeds at all. Each is aiming to keep its sensor's TEMPERATURE on its target.

 

[JamesEnquiry]

Thank you guys, I downloaded the latest System Information Viewer and, as you suggested, the reading in HW Monitor was incorrect. Tha CPU fan spins at comfortable 850-950 under light load keeping the temp around 40C with an ambient temp of 25-28C and the chassis fans don't need to run faster than 750 rpm. So I suppose that's quite all right.
Should have done this in the first place, sorry for wasting your time.
Thanks again!

 

[Bearmann]

Excellent. Glad you got your answer.

 

[Paperdoc]

Glad you got it figured out and that was NOT a waste of anyone's time. Thanks for Best Solution.