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damaged fx-6350 stock fan?

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November 30, 2013 10:57:39 AM

Hi all,
I Think i might have a damaged amd stock fan
(before you say anything - yes, i will replace it soon!)
but anyway - the base of it looks really scratched up with stock thermal paste applied on top,
and it sounds a bit weird while spinning, kind of sandy/grainy at times,
it's not alot but feels like something that should't be happening...
it was quite loud as well even on silent setting
(gigabyte GA-970A-UD3P board)
so to get it quiet i opened the case and aimed a 92mm case fan at it from a distance...
to my surprise it makes it drop down rpm instantly, you can feel the difference in less than a second,
so now i decided to test things,
i switched off cpu fan control in bios so it should be running 100% all the time,
which i think is around 5000rpm... atleast according to bios reading,
but it's inconsistent .. slightly below 5000 .. and if i aim the case fan at it even on lowest speed from about 10cm distance - it drops rpm down to ~3500 instantly...
how is this possible?
also if i turn up this fan and put it close to the stock fan instead of ramping down it
will spin up over 5000 by some 2 or 3 hundred rpm...
that i could understand but what is going on with the ramping down?
the airflow is so small on low rpms you can hardly feel by putting your hand between the two fans...
what is the max rpm supposed to be on this fan anyway?

More about : damaged 6350 stock fan

November 30, 2013 11:00:47 AM

my initial idea was that it's some kind of pressure optimized fan and additional air pressure actually disturbs it? but such a small one...?
the case fan in question is a standard zalman cheap black 80mm case fan...
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November 30, 2013 2:43:21 PM

I think you will find anwers here,
http://en.wikipedia.org/wiki/Fan_control
read 3.4 is about "Pulse-width modulation".
It will probably reduce speed because of the extra airflow which will lower the temp of the cooler itself.
Amd fans are just loud,so you can call that grainy or something if you want.
It's probably like this?
http://www.youtube.com/watch?v=Wi0zI6gKayY
look at the rpm's too,it seems that they do go that high.
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November 30, 2013 7:50:11 PM

Vic 40 said:
I think you will find anwers here,
http://en.wikipedia.org/wiki/Fan_control
read 3.4 is about "Pulse-width modulation".
It will probably reduce speed because of the extra airflow which will lower the temp of the cooler itself.
Amd fans are just loud,so you can call that grainy or something if you want.
It's probably like this?
http://www.youtube.com/watch?v=Wi0zI6gKayY
look at the rpm's too,it seems that they do go that high.


yeah i don't think that's the case here, you see the one in the video sounds fine - mine has some small crackling noises on top of that so something might be wrong with tit...
and it's normal to reduce the speed when temps go down but my problem is that it does it while it's
set to run at max rpm constantly in bios (cpu fan control disabled) so it shouldn't change anything according to temps... and having a instant rpm decrease also shouldn't be happening... it should have a bit of a delay since i don't think the temps go down significantly in less than a second from giving it just a whiff of extra airflow...

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