New NF7-S2 slight issue

Discussion in 'Abit' started by pan762, Sep 25, 2005.

  1. pan762

    pan762 Guest

    I recently replace an Epox MB with a NF7-S2 (newegg $60.00).
    I really liked how much room this board gave me around the CPU socket,
    as it made installing the heatsink/fan so much easier.

    Athlon XP 2800+, not overclocked (yet)
    Using Coolermaster Silent Xtream II (very quit, large fan) which
    worked just fine in the Epox MB.

    Audigy 2 value (MB audio disabled)

    MSI Geforce NX6200 video (not a gamer)

    Have two sticks of corsair 400Mhz ram, total of 1G, installed in slot
    3 and 2 using dual channel just fine.

    Was able to install XP on the WD SATA without having to install
    special drivers via the floppy (enabled SATA as boot drive in the BIOS
    -- very cool). Case has four additional fans.

    Running an Vantec ION 400WPS.

    The whole thing is very stable and I've noticed the BIOS has lots of
    options for me to tweak with in the coming months. I went to PC
    Health and this is where I noticed a slight problem. The CPU
    temperature is a fairly stable 34-38 at idle and the fan is working
    fine ( I have a window in the side of the case and can keep an eye on
    it) but PC Health shows zero RPM for all fans.

    Installed AbitEQ and it shows the CPU fan running at the specified RPM
    but no other fans.

    Installed Nvidia utility and it shows no signal from fans either.
    I shut down and pulled the fans from the headers, double checked to
    make sure they were the correct headers, cleaned the contacts and
    re-inserted. No change.

    I plan on setting the Bios to shut down when the chip overheats but in
    the past have also set the BIOS to shut down should the CPU fan die.
    Obviously I cant do this.

    I'm thinking that part of the BIOS might be corrupted. Is there any
    chance that a BIOS flash will resolve this minor issue? I'm not sure
    it's important enough to risk the slight chance of a screw-up when
    flashing the BIOS (i've done this several times on other boards
    without a problem but I'm always reading horror stories).

    Comments, opinions and suggestions appreciated. I've searched but
    have not found any reference to this problem.

    pan762, Sep 25, 2005
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  2. pan762

    RonK Guest

    Are they the 3 wire fans ?
    RonK, Sep 25, 2005
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  3. pan762

    Målidõk Guest

    I have the same board (S2G) and the only fan that shows with AbitEQ is the
    CPU fan. It seems that a fan has to reach a minimum rpm before it picks up
    on them.
    Download Everest Home from Lavalys and you will find that it quite happily
    shows the slower fans.
    Excellent diagnostic tool as well.

    Målidõk, Sep 25, 2005
  4. pan762

    pan762 Guest

    Yes, they are, though they are larger and slower RPM fans to reduce
    pan762, Sep 25, 2005
  5. pan762

    pan762 Guest

    Thanks for the suggestions. DL of Everest Home did indeed show the
    sensors picked up the fans. I didn't want to return the MB for such
    a small thing and probably wouldn't have as long as I know the fans
    are running.

    Still, I won't be able to set the system to shut down if the CPU fan

    Thanks again.
    pan762, Sep 25, 2005
  6. pan762

    patrickp Guest

    Many mobo BIOSs won't detect fans spinning at under 2000rpm or so;
    sometimes even higher. Ssince you're "Using Coolermaster Silent
    Xtream II (very quit, large fan)," I would assume it's a quite slow
    spinning fan and may not be detected.

    Could your other fans be similarly affected - AFAIK many hardware
    monitors will detect fans spinning at less than 2000rpm, but not a lot

    Incidentally, I never connect fans directly to the mobo, so as not to
    draw too much power from it. I connect them directly to the PSU, and
    just run the tacho wires for the ones I want to monitor to the mobo
    sockets. Works fine, but not recommended if you're using the 7V
    trick, as the low side of the fans is not then directly connected to
    the common ground.


    <> - take five to email me...
    patrickp, Sep 25, 2005
  7. In addition to using Everest, you can use SpeedFan (free) to control the
    fans, display fan speeds and temps, etc. One wierdness I've noticed with
    this mainboard, is that when I boot the machine, fan speeds are detected as
    0 rpm by SpeedFan. Once I fire up Everest to check fan speed, all display
    correctly in SpeedFan. The only fan in my system that the BIOS like is the
    120mm on the back of the case. That one is detected but shows up as red.
    Regardless, I've found this board to run much cooler than my other system,
    most likely in part to the fact that the case has a side vent in addition to
    that 120mm fan.


    Margaret Wilson, Sep 26, 2005
  8. pan762

    - HAL9000 Guest

    Just like a DC generator, the amplitude of the "spin" signal from your
    fans is (directly) proportional to the fan's RPM. The spin signal is
    large when spinning fast and small when spinning slowly. Some fans
    may produce a better spin signal than others.

    Since your cpu can die from heat, but not from a non spinning fan, I
    would (and do) just set the shutdown to a cpu temp or 65 or 70 degrees


    Motherboard Help By HAL web site:

    On Sun, 25 Sep 2005 18:46:43 GMT, wrote:
    - HAL9000, Sep 26, 2005
  9. pan762

    pan762 Guest

    My first abit board was a KT7. I was appreciative of all the
    information available online about settings in the bios. Anyone have
    some good tweaking tips for this board?
    pan762, Sep 27, 2005
  10. pan762

    Jed Clear Guest

    I think you'll find a digital signal on the fan tach output, not an
    analog voltage level. The signal goes through a Schmitt trigger, into a
    counter in the monitoring h/w. If you run the fan with 12V, you need to
    divide the voltage down to TTL levels.

    Check sections 6. and 7.3 of

    Jed Clear, Nov 7, 2005
  11. pan762

    - HAL9000 Guest

    Yea, I guess I implied an analog signal their. LOL, I wasn't thinking
    it though - I was just shooting for layman's terms.

    The fan signal is nominally the output of a hall effect device. If
    your not familiar with these, a quick search gave this page as an

    As the fan speed slows down - the hall effect ic stops producing an
    output - no magnetically induced voltage.


    Motherboard Help By HAL web site:
    - HAL9000, Nov 7, 2005
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