Fan spikes up to 35,000 rpm on software

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35,000 to 50,000 ... I believe you man 3,500 to 5,000 because I am not aware of ANY computer fans that runs in the tens of thousands of RPM.

what is the max of your corsair fan speed, I have mine on my case respond to temps from 50c so when I game all fans of the video card and case are running full out... all depends how you setup your fans while gaming

 
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Nope I mean 35,000 :
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Obviously it doesn't get to that speed but It says it on the software so I'm confused (fan #4 in picture)
 
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Just a protip for future: Window has a "Snipping Tool" built in that allows you to take screenshots of what's onscreen. You can also generally use PRTSCN on your keyboard and then copy & paste it into paint in order to get an image. It will be much clearer and will not have scan lines.
 
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Well, 37,678 rpm is impossible by a long shot! Certainly it's possible that the Corsair Link software is making the error. If so, one solution would be to un-install it then reboot. Delete the old copy of the installation file. This will set all the hardware to default settings and still provide adequate cooling. Then download and re-Install Corsair Link in case the new copy corrects some problem with the old copy.

I can think of two other ways that this can happen with NO error by Link. Both require that you figure out exactly which mobo header is called "Fan #4" in the Link display, and investigate there.
1. There may be a bad / loose connection between the fan and the mobo port, causing the speed signal (Pin #3 of the header and fan wiring) to be full of electrical noise spikes, and confusing the pulse counting circuits of the header. Check the wiring for a loose contact or bad connection. Also try simply unplugging the fan from the header and then plugging back in again, a few times. This action might "scrub" dirt off the contacts. Be careful not to disturb other connections.

2. IF you have more than one fan attached to that mobo port AND if it is not done properly, this problem could happen. The important part here is that the speed signal fed into the mobo header on Pin #3 must be from only ONE fan. Two or more both connected there can cause pulse counting errors. Any Splitter or Hub sold today will prevent this by NOT connecting more than one fan's speed signal. But some very early old Splitters did this wrong and connected all the fans' signals together. Also, some people who custom-wired two or more fans together simply by joining like-coloured wires made the same error. But unless you did one of those latter things, this is not likely.
 
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I suggested a couple of ideas above that are less drastic than replacing the mobo. But, if your problem is ONLY that the fan speed readings are impossibly high, you can afford to simply ignore them.

Correct fan speed readings are NOT required to control the fans. The automatic control system actually is controlling TEMPERATURES, not fan speeds. In each case it has a temperature sensor and a related target reading for that temp. The control system manipulates the signals to the fan on its header to change the fan speed to whatever ti takes to achieve the target TEMPERATURE at the sensor. It really does not care what the fan speed is, and it does not even look at that info in order to achieve control.

Fan speed measurement by the mobo header has two different functions. One is simply to display it for your info and amusement. Unfortunately, this occasion has caused worry instead. The other is to monitor for fan failure. Most mobos will check the speed signal and, if it falls to zero (or, in some cases, below some minimum setting) will try to re-start it and, failing that, will issue a failure warning to the user so you can repair. In the specific case of the cooling system attached to the CPU_FAN header, the mobo may take more drastic action if the fan fails in order to prevent damage to the CPU chip from overheating. However, none of those failure detection systems are worried about a reading that is to HIGH. So, neither of the uses of the fan speed reading is critical for your situation.
 
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While warm, those temps between the CPU and GPU are not out of spec. You don't list your CPU or cooler or what model your GPU is or if you have a custom fan profile set up like in Afterburner, so we can't get a read on where you are relative to similar equipment. Oh and the model of your case would help to for determining airflow in and out.
 
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I have a STRIX GTX 1080 and an I7-7700K. My case is a Phantek P400s and I have three corsair LL120's connected to a fan splitter which is connected to my mobo as my mobo is a Z270-A which only has 2 Fan headers
 
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It's not uncommon for MOBO's to do things like this. For example, my new MOBO's temperature sensors were showing 115-120 degrees celsius in monitoring programs, but it wasn't actually that temp. Sent it back and now it's fine.
 
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Two other things, one of my corsair ll120 fans has a mid pitched noise coming from it and will sometimes randomly speed up and then slow down (I think it's speeding and slowing down but it might just be that the noise is making me think it's speeding up and slowing down) I don't know if that's normal and 2, there's always a very high pitched noise coming from somewhere in my pc, even when shut down and power is just coming from the PSU, I think it's the PSU powering the pc and I'm assuming that would be normal but I'm not sure
 
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