Erratic cpu fan readings

[uncleglenny]

Hello everyone I appoligize if this is the wrong place to post this but i could use some help, recently i upgraded from my stock hpe 110f to an haf 922, asus M4A88T-v evo and an Ultra 750 watt psu, so i am still using stock cpu(AMD 925) and memory, but when i booted her up the cpu fan(stock 3 pin plugged into 4 pin mobo) was screaming so i replaced it with a Arctic 7 freezer, booted it up and was getting a cpu fan warning, but the fan seems to be working fine so disabled the warning in the bios, but noticed the rpm reading are all over from 0-29000 back to 600 and so on also i noticed with Everest the same thing with erratic fan readings what could cause this?

 

[beanoslim]

If you have cool n quiet enabled in the bios the fan speeds will go up and down with the cpu heat.

If you plug a 3 pin fan into a 4 pin pwm socket the fan controll won't work, it has to be a 4 pin pwm fan otherwise the fan will just spin at full speed constantly.

The fan could also be spinning unnecessarily if the heatsink and thermal paste isn't applied properly.
http://www.arcticsilver.com/amd_application_method.html#

 

[uncleglenny]

my temps are all good low 30s the fan speed in bios goes from N/A to 700rpm then shoots up to 19640 rpm then back down to the 7-800 range could it be a bad fan?

 

[beanoslim]

When it shoots up does the fan actually start spinning faster?

Have you tried the same fan on a different slot and a different fan on that slot.

Sounds like a faulty board sensor??

 

[uncleglenny]

i just returned the heat sink and cooler for the exact same one and it does the same thing should i try a bios update, this is the first build i have ever done so bare with me.

 

[beanoslim]

Have you tried what I suggested about trying the cooler and fans in different slots.

If it has the same problem on one fan slot you know that is your problem and you need to use a different one.

I am trying to work out what it could be but if you don't respond to my questions its difficult for me to move on to the next possible solution.

Your cpu is supported from the 1st bios release 0304 so should be ok but I'd get the latest anyway.

 

[uncleglenny]

Have you tried what I suggested about trying the cooler and fans in different slots.

If it has the same problem on one fan slot you know that is your problem and you need to use a different one.

I am trying to work out what it could be but if you don't respond to my questions its difficult for me to move on to the next possible solution.

By slots do you mean other four pin fan plugs and if so is there more then one?

 

[beanoslim]

What I'm suggesting is plugging your cooler into any of the other available fan slots on your mobo.

If it runs fine i.e. doesn't jump all over the place you know its not a fan problem.

Then plug a different fan into the original fan slot and if it jumps all over the place you know its the slot.

If your cooler is a 4 pin pwm fan it will still run off a 3 pin fan slot just without pwm control.

Hope this helps.

 

[uncleglenny]

What I'm suggesting is plugging your cooler into any of the other available fan slots on your mobo.

If it runs fine i.e. doesn't jump all over the place you know its not a fan problem.

Then plug a different fan into the original fan slot and if it jumps all over the place you know its the slot.

If your cooler is a 4 pin pwm fan it will still run off a 3 pin fan slot just without pwm control.

Hope this helps.

ok did as you suggested and pluged it into the case fan plug and it all the reading are fine, and this was the second fan I,ve had on the cpu and both did the same thing so it must be a faulty mobo?

 

[beanoslim]

Seems like a faulty fan socket but back to another question.

When the speed of the fan jumps up does the fan actually start to spin faster??

If it doesn't then it seems that you just have a sensor problem therefore you can still use the fan slot.

If it does make the fan spin erratically I wouldn't use it.

If your mobo is still under warranty it may be worth an RMA, otherwise I'm sure the mobo is still fine to use.

BTW what bios are you using?

If you download the manual and look at page 20 no:1 shows you the 2x4 pin fan headers.
http://support.asus.com/download/download.aspx?SLanguage=en-us

 

[uncleglenny]

Seems like a faulty fan socket but back to another question.

When the speed of the fan jumps up does the fan actually start to spin faster??

If it doesn't then it seems that you just have a sensor problem therefore you can still use the fan slot.

If it does make the fan spin erratically I wouldn't use it.

If your mobo is still under warranty it may be worth an RMA, otherwise I'm sure the mobo is still fine to use.

BTW what bios are you using?

If you download the manual and look at page 20 no:1 shows you the 2x4 pin fan headers.
http://support.asus.com/download/download.aspx?SLanguage=en-us

nope the fan stays the same speed and as far as bios is concerned it is version 0302

 

[beanoslim]

nope the fan stays the same speed and as far as bios is concerned it is version 0302

Start by updating your bios to latest version.

Download OCCT and install.

Turn cool n quiet on in your bios.

Plug your cpu fan into the 4 pin cpu fan socket and run occt.

Check that as the test starts after 1 min the fan speeds up to control the heat, if it does then everything is working fine.

If it doesn't try it in the other 4 pin socket and do the same test.

You may find the bios update helps and this is assuming that the AF7 has a 4 pin pwm fan.

 

[uncleglenny]

if your readings are irratic but not actualy having an effect on the fanspeed . you need to swap the fan mode from or to rpm or pwm.
gpu-z reads my pwm fans on my arctic cool xtreme wrong. variaing from 400 to 16000 (the fan is 900-1500rpm) but speed fan reads i correctly. so it may just be a software/ sensor conflict.

I dont think that is the issue as the fan reads fine on the case fan header, and i am reading it right from the Bios, I just did an RMA for it so I'm gonna send it back.

 

[beanoslim]

I would suggest a bios update before that just to be sure.

 

[uncleglenny]

I used the asus software to check for a bios update but it says no compatible matches found, but on their website it says they have version 0304 so should I use that?

 

[uncleglenny]

ok just an update I downloaded Bios version 0306 flashed it and theres no difference, so looks like a tear down, what a pita !

 

[beanoslim]

Sounds like a faulty sensor on that fan slot, you could also try speedfan and HWmonitor to see what they say.

 

[uncleglenny]

Ya did the bios update and no difference, anyway did an rma and sent it back this morning.

 

[hallucynogenyc]

Has it been solved? I'm having the exact same problem described here, random 19640rpm readings from the CPU fan. I'm using the arctic cooling freezer rev.2, and the M4A87TD/USB3 asus motherboard.

 

[beanoslim]

Have you tried everything suggested here about switching fans and slots and updating the bios.

The OP has returned his board as faulty, do you have that option if needed?

 

[hallucynogenyc]

Yes, i have the option, although I purchased it online and it will be a pain in the ass to RMA it...

I've done all the suggested above with the exact same results than the original poster. However, I've found an interesting thing. The problem disappears with qfan turned off or with qfan on manual mode, it apppears when it's set on standard turbo or silent mode. How can this be? I thought it had to do with PWM modulation until I found that it works flawlessly in manual mode (PWM being used here too, right?)

 

[jorge007]

Strange, have the same behaviour with my M4A87TD/USB3 and Arctic Cooling Freezer 7 all bought online last week.
The values are changing from N/A to more than 19000RPM in the bios but the cooler stays unimpressed. The temps are all ok even with running prime95. The asus tools show cpu fan values until 150000RPMs which are definitively ridiculous.
I also do not want to send back my board (as it has to be sent back with all the stuff what that was inside the package and after installing a system it is pretty hard to find out which screw comes from which package).
Are there even more users complaining the same issue?

 

[beanoslim]

Has anyone tried emailing Asus, they may be aware of it and be planning an update to fix.

 

[uncleglenny]

I just emailed them about this problem, and will keep you posted.

 

[uncleglenny]

Just a thought I also am using an arctic 7 cooler wonder if that is the issue, although it did work fin when plug into the chassis fan slot on the mobo, thats just a weird coincidence !