Bizarre CPU fan issues

Discussion in 'Computer Support' started by Jase, Feb 4, 2004.

  1. Jase

    Jase Guest

    Hi,

    I've been having problems with my AMD Athlon XP 2000+ CPU overheating
    recently so I bought a Akasa King Copper 824CU today.

    I fitted the new fan and switched the machine on but before it tested the
    memory the machine stopped and displayed "CPU Fan error" (or something like
    it) across the middle of the screen then powered itself down. This happened
    before I could access the BIOS.

    I had no idea what the problem was as I connected the new cable to the same
    power connector as the old fan (on the mobo). I then tried connecting the
    old fan (lying loose in the system) into the mobo connector and new fan
    (still on the CPU) onto a spare power connector - and it worked! This then
    allowed me to get into the BIOS and I disabled "Detect CPU Fan Post" - I've
    no idea what it does but I can now connect the new fan into the mobo power
    supply and it works fine - so far it appears to cool the CPU by over 20 deg
    C!

    However the fact it detected a problem with this BIOS setting enabled
    worried me. Does anyone know what the issue is and how to resolve it?

    One other question... my old fan *seemed* to blow air out but the new fan
    seems to suck air in - what is the correct way?
     
    Jase, Feb 4, 2004
    #1
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  2. Jase

    philo Guest

    "Jase" <> wrote in message
    news:bvriot$1010s2$-berlin.de...
    > Hi,
    >
    > I've been having problems with my AMD Athlon XP 2000+ CPU overheating
    > recently so I bought a Akasa King Copper 824CU today.
    >
    > I fitted the new fan and switched the machine on but before it tested the
    > memory the machine stopped and displayed "CPU Fan error" (or something

    like
    > it) across the middle of the screen then powered itself down. This

    happened
    > before I could access the BIOS.
    >
    > I had no idea what the problem was as I connected the new cable to the

    same
    > power connector as the old fan (on the mobo). I then tried connecting the
    > old fan (lying loose in the system) into the mobo connector and new fan
    > (still on the CPU) onto a spare power connector - and it worked! This

    then
    > allowed me to get into the BIOS and I disabled "Detect CPU Fan Post" -

    I've
    > no idea what it does but I can now connect the new fan into the mobo power
    > supply and it works fine - so far it appears to cool the CPU by over 20

    deg
    > C!
    >
    > However the fact it detected a problem with this BIOS setting enabled
    > worried me. Does anyone know what the issue is and how to resolve it?
    >
    > One other question... my old fan *seemed* to blow air out but the new fan
    > seems to suck air in - what is the correct way?
    >
    >



    looks like your bios is looking for a certain RPM
    and the new, larger fan with it's lower RPM looks like an error

    that happend to me onone machine and i had to update the bios
    in order not to get the low RPM error

    fans generally blow in....towards the cpu
     
    philo, Feb 4, 2004
    #2
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  3. Jase

    Jase Guest

    "philo" <> wrote in message
    news:...
    >
    > looks like your bios is looking for a certain RPM
    > and the new, larger fan with it's lower RPM looks like an error
    >
    > that happend to me onone machine and i had to update the bios
    > in order not to get the low RPM error


    Ahhhhh.... that makes sense.

    Why/how do new fans have a lower RPM but maintain such good cooling?
     
    Jase, Feb 4, 2004
    #3
  4. Jase

    Kráftéé Guest

    Jase wrote:
    > "philo" <> wrote in message
    > news:...
    >>
    >> looks like your bios is looking for a certain RPM
    >> and the new, larger fan with it's lower RPM looks like an error
    >>
    >> that happend to me onone machine and i had to update the bios
    >> in order not to get the low RPM error

    >
    > Ahhhhh.... that makes sense.
    >
    > Why/how do new fans have a lower RPM but maintain such good cooling?


    Better effeciency
     
    Kráftéé, Feb 4, 2004
    #4
  5. Jase

    ICee Guest

    Kráftéé wrote:
    > Jase wrote:
    >> "philo" <> wrote in message
    >> news:...
    >>>
    >>> looks like your bios is looking for a certain RPM
    >>> and the new, larger fan with it's lower RPM looks like an error
    >>>
    >>> that happend to me onone machine and i had to update the bios
    >>> in order not to get the low RPM error

    >>
    >> Ahhhhh.... that makes sense.
    >>
    >> Why/how do new fans have a lower RPM but maintain such good cooling?

    >
    > Better effeciency


    It could also be that the tach signal from the new fan is 'dirty' and
    not being read properly in the BIOS. Also, some fans draw more current
    than the header on the MB can supply, which will cause problems. In
    these cases, it's best to just connect the CPU fan directly to the PSU,
    as you have done.
    Just set the temp alarm in the BIOS and/or run a monitoring program to
    look at the temps and/or voltages, and there won't be any problem if the
    fan should fail and the CPU overheats. A good one is MotherBoard
    Monitor:
    http://mbm.livewiredev.com/
     
    ICee, Feb 4, 2004
    #5
  6. Jase

    philo Guest

    "Jase" <> wrote in message
    news:bvrjen$102fdd$-berlin.de...
    > "philo" <> wrote in message
    > news:...
    > >
    > > looks like your bios is looking for a certain RPM
    > > and the new, larger fan with it's lower RPM looks like an error
    > >
    > > that happend to me onone machine and i had to update the bios
    > > in order not to get the low RPM error

    >
    > Ahhhhh.... that makes sense.
    >
    > Why/how do new fans have a lower RPM but maintain such good cooling?
    >
    >


    The one I used was physically larger than the old one...
    so "pushed" more air but at a lower RPM
     
    philo, Feb 4, 2004
    #6
  7. Jase wrote:

    > I had no idea what the problem was as I connected the new cable to the same
    > power connector as the old fan (on the mobo). I then tried connecting the
    > old fan (lying loose in the system) into the mobo connector and new fan
    > (still on the CPU) onto a spare power connector - and it worked! This then
    > allowed me to get into the BIOS and I disabled "Detect CPU Fan Post" - I've
    > no idea what it does but I can now connect the new fan into the mobo power
    > supply and it works fine - so far it appears to cool the CPU by over 20 deg
    > C!


    Kopper is King. :)

    The old HS was probably a cheezy OEM aluminum job, right?

    > One other question... my old fan *seemed* to blow air out but the new fan
    > seems to suck air in - what is the correct way?


    That's a holy wars issue. My answer: whichever way the HSF manufacturer
    supplied it.

    --
    Blinky Linux RU 4892F
    Stolen SCO Code: http://snipurl.com/stolen
     
    Blinky the Shark, Feb 4, 2004
    #7
  8. Jase

    Graeme Guest

    "philo" <> wrote in message
    news:...
    >
    > "Jase" <> wrote in message
    > news:bvrjen$102fdd$-berlin.de...
    > > "philo" <> wrote in message
    > > news:...
    > > >
    > > > looks like your bios is looking for a certain RPM
    > > > and the new, larger fan with it's lower RPM looks like an error
    > > >
    > > > that happend to me onone machine and i had to update the bios
    > > > in order not to get the low RPM error

    > >
    > > Ahhhhh.... that makes sense.
    > >
    > > Why/how do new fans have a lower RPM but maintain such good cooling?
    > >
    > >

    >
    > The one I used was physically larger than the old one...
    > so "pushed" more air but at a lower RPM
    >


    Talking about fans, my CPU fan that came with a 3GHz P4 runs at about
    3300rpm (when the PC is more or less idle). At this speed it is quite noisy.
    Is it possible to replace these? If so, any suggestions.
    TIA
     
    Graeme, Feb 5, 2004
    #8
  9. Jase

    Bill Purvis Guest

    Have a look here

    http://www.quietpc.com/

    "Graeme" <> wrote in message
    news:bvtt6o$10uhm9$-berlin.de...
    > "philo" <> wrote in message
    > news:...
    > >
    > > "Jase" <> wrote in message
    > > news:bvrjen$102fdd$-berlin.de...
    > > > "philo" <> wrote in message
    > > > news:...
    > > > >
    > > > > looks like your bios is looking for a certain RPM
    > > > > and the new, larger fan with it's lower RPM looks like an error
    > > > >
    > > > > that happend to me onone machine and i had to update the bios
    > > > > in order not to get the low RPM error
    > > >
    > > > Ahhhhh.... that makes sense.
    > > >
    > > > Why/how do new fans have a lower RPM but maintain such good

    cooling?
    > > >
    > > >

    > >
    > > The one I used was physically larger than the old one...
    > > so "pushed" more air but at a lower RPM
    > >

    >
    > Talking about fans, my CPU fan that came with a 3GHz P4 runs at about
    > 3300rpm (when the PC is more or less idle). At this speed it is quite

    noisy.
    > Is it possible to replace these? If so, any suggestions.
    > TIA
    >
    >
     
    Bill Purvis, Feb 5, 2004
    #9
  10. Jase

    kony Guest

    On Thu, 5 Feb 2004 17:05:55 -0000, "Graeme" <>
    wrote:


    >Talking about fans, my CPU fan that came with a 3GHz P4 runs at about
    >3300rpm (when the PC is more or less idle). At this speed it is quite noisy.
    >Is it possible to replace these? If so, any suggestions.
    >TIA
    >


    Due to the design, incorporating the fan into a plastic shroud, it's
    harder than it "could" be. You might put a resistor or series of
    didoes, in series on the power leads, or take off the shroud,
    carefully cuttin out the fan and leaving a flat hole where you could
    attach the fan of your choice.

    Alternatively you could just drill holes in the fins and attach the
    fan with 4 L-brackets and screw/bolts, or just buy a new 'sink. It's
    a shame that after all this time, intel still uses such a proprietary
    'sink... I guess they think it looks cool.
     
    kony, Feb 5, 2004
    #10
  11. Jase

    Graeme Guest

    "Bill Purvis" <> wrote in message
    news:bvu19b$bds$...
    > Have a look here
    >
    > http://www.quietpc.com/
    >
    > "Graeme" <> wrote in message
    > news:bvtt6o$10uhm9$-berlin.de...
    > > "philo" <> wrote in message
    > > news:...
    > > >
    > > > "Jase" <> wrote in message
    > > > news:bvrjen$102fdd$-berlin.de...
    > > > > "philo" <> wrote in message
    > > > > news:...
    > > > > >
    > > > > > looks like your bios is looking for a certain RPM
    > > > > > and the new, larger fan with it's lower RPM looks like an error
    > > > > >
    > > > > > that happend to me onone machine and i had to update the bios
    > > > > > in order not to get the low RPM error
    > > > >
    > > > > Ahhhhh.... that makes sense.
    > > > >
    > > > > Why/how do new fans have a lower RPM but maintain such good

    > cooling?
    > > > >
    > > > >
    > > >
    > > > The one I used was physically larger than the old one...
    > > > so "pushed" more air but at a lower RPM
    > > >

    > >
    > > Talking about fans, my CPU fan that came with a 3GHz P4 runs at about
    > > 3300rpm (when the PC is more or less idle). At this speed it is quite

    > noisy.
    > > Is it possible to replace these? If so, any suggestions.
    > > TIA
    > >
    > >


    Thanks for the link. Is there any info on the performance of the Intel
    supplied fan (airflow, noise, etc)? I'd hate to go and spend money on a
    'quiet' fan just to find it's just as noisy as the one I already have.
     
    Graeme, Feb 5, 2004
    #11
  12. Jase

    kony Guest

    On Thu, 5 Feb 2004 22:39:00 -0000, "Graeme" <>
    wrote:


    >> > Talking about fans, my CPU fan that came with a 3GHz P4 runs at about
    >> > 3300rpm (when the PC is more or less idle). At this speed it is quite

    >> noisy.
    >> > Is it possible to replace these? If so, any suggestions.


    >Thanks for the link. Is there any info on the performance of the Intel
    >supplied fan (airflow, noise, etc)? I'd hate to go and spend money on a
    >'quiet' fan just to find it's just as noisy as the one I already have.


    Typically Intel uses Sanyo Denki fans,
    http://sanyodb.colle.co.jp/product_db_e/coolingfan/dcfan/cooling_dcfan.html
    A 3300RPM fan would be what Sanyo considers an "H" (as-in, high) speed
    model. Choose same or different manufacturer's Medium or Low speed
    (some manufacturers have even more gradations) model to reduce the
    noise. The thicker the fan, the more air produced per RPM, the better
    the airflow to noise ratio.

    Depending on exactly what you're wanting to do, replace only the
    original fan vs. replace whole 'sink, choose the diameter than barely
    fits, as large as possible, with RPM between 1800-2200RPM. Some
    people use even lower RPM fans, but considering your 3GHz CPU it'd be
    good to stay near 2000 RPM, not much lower. Ball bearing fans are far
    more reliable than generic sleeve-bearing models, but slightly
    noisier... for utmost sound reduction choose only sleeve bearing if a
    Panaflo or Papst fan.
     
    kony, Feb 5, 2004
    #12
  13. Jase

    Graeme Guest

    "Bill Purvis" <> wrote in message
    news:bvu19b$bds$...
    > "Graeme" <> wrote in message
    > news:bvtt6o$10uhm9$-berlin.de...

    <snip snip>
    > > Talking about fans, my CPU fan that came with a 3GHz P4 runs at about
    > > 3300rpm (when the PC is more or less idle). At this speed it is quite

    > noisy.
    > > Is it possible to replace these? If so, any suggestions.
    > > TIA
    > >
    > >


    > Have a look here
    >
    > http://www.quietpc.com/


    Some nice fans. I'm not sure which would be best.
    http://www.quietpc.com/uk/p4cooling.php#7000a
    http://www.quietpc.com/uk/p4cooling.php#5700d
     
    Graeme, Feb 6, 2004
    #13
  14. Jase

    Bill Purvis Guest

    Get in contact with them, they are VERY helpful

    "Graeme" <> wrote in message
    news:bvvgfs$1080gp$-berlin.de...
    > "Bill Purvis" <> wrote in message
    > news:bvu19b$bds$...
    > > "Graeme" <> wrote in message
    > > news:bvtt6o$10uhm9$-berlin.de...

    > <snip snip>
    > > > Talking about fans, my CPU fan that came with a 3GHz P4 runs at

    about
    > > > 3300rpm (when the PC is more or less idle). At this speed it is

    quite
    > > noisy.
    > > > Is it possible to replace these? If so, any suggestions.
    > > > TIA
    > > >
    > > >

    >
    > > Have a look here
    > >
    > > http://www.quietpc.com/

    >
    > Some nice fans. I'm not sure which would be best.
    > http://www.quietpc.com/uk/p4cooling.php#7000a
    > http://www.quietpc.com/uk/p4cooling.php#5700d
    >
    >
     
    Bill Purvis, Feb 6, 2004
    #14
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