CPU/CPU opt fans running at 0-300 RPM

ssedlmayr

Honorable
Sep 29, 2013
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10,510
I have an Asus RIVE and a 3930K.

I put my computer to sleep and came back hours later to turn it back on; it started acting up, going into a sort of kernel panic where it would try to boot but nothing would come on the screen, it would power off and then power on again automatically, over and over. So I shut it down, turned off the PSU and unplugged it, waited a minute or so, plugged it back in and powered on and it booted to a CPU fan error.

Inspecting the fans I found that the main fan on the cooler (I have a Noctua D14) was stopped. I opened the case and played with the fans and found that the stopped fan worked fine on other fan headers. I tried a 3-pin fan on the CPU fan header and it worked fine; I tried another 4-pin on the CPU fan header and it also would not start.

So I turned off fan control; fans ran fine. I fiddled with the BIOS some more and set the CPU fan profile to manual and tweaked it a little. I restarted several times and it seemed to work fine, so I put everything back together and sealed up the case and restarted and... CPU fan error. So I went into the BIOS again and disabled errors for the CPU fan.

Booting into Windows I played with Realtemp, HWInfo, Open Hardware Monitor, Speedfan and the Asus PC Diagnostics tool and found that at idle the CPU opt fan runs at about 200 RPM, and maxes out at 300. The CPU fan idles at * 0 * and also maxes out at 300 under load. I set the CPU fan profile to turbo in the BIOS, no change. I tested my hardware with the Asus utility and everything seems fine. Realtemp reports normal temps at idle and under load, about 30-35 idle and maybe 45-50 during a stress test. Ambient temp is 19. Not great temps, but not horrible either.

What am I missing? Is my mobo or CPU failing or partially failing? It seems like they are not getting enough power to those two fan headers. Could it be a failing CPU or a damaged VRM?
 
Solution
CPU fan header sensor has packed up. Either RMA the motherboard if under warranty or do as you have done, switch off cpu fan detection in bios and live with it.

ssedlmayr

Honorable
Sep 29, 2013
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Oy. Thanks das_stig; should I be concerned that it seems like the same thing has happened to the CPU opt as well? Could it be indicative of a deeper issue? Those headers are physically right next to the VRM, although I don't know how close they are circuit wise on the PCB.

...I should also mention I got a Q-code on the mobo LED when this whole thing started indicating CPU error.
 


asus it seems has a history with dodgy fan connectors my dads from 2007 did that and my own amd 970 asus did that as well to cpu fan but also made my fans go 6,000rpm lol so i sent it back to amazon after 3 months this should never happen

 

ssedlmayr

Honorable
Sep 29, 2013
7
0
10,510


Hm, that sucks to hear, especially since generally Asus boards are very high in quality and otherwise I've had good use out of them (wife has an RIIIE with no issues); I wonder why they skimped on the fan headers? I mean, high quality capacitors and chokes, super clean traces, yada, yada... and then crap fan headers? Can't be that expensive for a premium brand that is supposed to attend to every detail. Hope this doesn't happen to the RIVE BE I have on back order, although I probably will have everything on controllers for that build.
 


i had issues with asrock 970 chipset as well but that didnt even boot properly lol finally i went for gigabyte and this seemed to work without a hitch just a unsual audio driver choice but got round that lol.

Like i said though they do seem to have issues with fan headers and i plugged them up to my psu completely fine lol