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Is it possible to replace CPU fan with large heatsink?

Discussion in 'Electronic Basics' started by Ricky Spartacus, Dec 5, 2003.

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  1. My AMD 330 MHz CPU fan made more noises after using motor oil. When I
    threw out the fan, the computer freezes too frequently. So, I'm going
    to use a large piece of heatsink, the kind used on stereo receivers
    and bond it to the CPU heatsink. This will cut the noise down even
    further and want to know if this is a good idea?

    Thanks
    Ric
     
  2. Jamie

    Jamie Guest

    For the lousy 10-20 $, why not go and get a proper heatsink and fan for it
    instead of trying to cook the chip?
     
  3. It is certainly a better idea than operating the small heat sink with
    no fan. The problem with large heat sinks is usually clearance over
    the rest of the board. And on some motherboards, the exhaust air flow
    from the processor fan also cools some voltage regulator power tab
    transistors sitting nearby. Don't neglect those.
     
  4. cpemma

    cpemma Guest

    The short answer is no, unless you need a reason to upgrade. Get another
    socket 7 HSF, and if you want negligible noise, run the fan at 7v
     
  5. N. Thornton

    N. Thornton Guest

    To run fanless you'd need a heatsink several times the size of whats
    there already. You'd probably cook your CPU. Having said that, I had
    one PC that ran with no CPU fan, some will.

    Regards, NT
     
  6. Thought about the practical idea of cooling fan cooling other
    components. So I went ahead and got the $10-20 fan. Tried to run it on
    5vdc, no go. So 12vdc on this PanaFlo is pretty quiet - can't here a
    thing. I felt kinda stupid not realising that a quality fan can be so
    quiet. Now, no more freezes or slow down and it's running 4X faster it
    seems. Thanks for the advices, folks.
    Spart
     
  7. There are options that do not produce noise, you have to transfer the
    heat to a large heatsink mounted onto the case.

    One possibility would be a heat pipe, which uses an easily evaporating
    liquid to cool the CPU. The steam condenses at the heatsink and dribbles
    back to the CPU, where the cycle starts again. A hog to design, probably
    out of reach to hobbyist. Some notebooks use that sort of device.

    The second way is to use water cooling. The CPU, chip set and graphic
    card processor heatsinks are replaced by small devices, through which
    water flows. The hot water then is cooled at the case-mounted heat sink.
    The stuff is commercially available in kit form (about 200 euro). Since
    water has a much higher heat capacity than air, the loud, fast blowing
    fans can be replaced by a almost inaudible aquarium pump. There are
    special power supply units available for use in such systems, so you can
    make do without the fan in there as well (another 150 euro or so).

    Whether that's worth if for a comuter that, judging by specification,
    must be about 4-5 years old, you have to decide yourself.

    If you do not want to spend that amount of money, you can buy large,
    hence slow-turning, high quality fans with special bearings (e.g.
    Papst).
     
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