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Best heat sink compound?

Discussion in 'Electronic Repair' started by DaveC, Dec 1, 2003.

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  1. Wow, I feel like such an insignificant wuss, not having my CPUs running 24/7
    on such an important project.

    Leonard Caillouet
  2. Cher

    Cher Guest

    Darkmatter lost his credibility with his FIRST post.

    He is still trying to prove he knows what he is talking about.
    Hasn't done a thing for me.

    Hey guy, grow up and get a life.

    If you have some relevent information state it and get on with your
    life. It doesn't matter to you what I or other people do after that -
    only what you do; and what you do doesn't matter to me!

    As for me, I want this CPU as cool as can be.
    I read the install instructions on the Artic Silver web site.
    I use Artic Silver because every test I have seen shows it to be
    better by enough to make a difference to ME.

    Also note (per the Artic Silver FAQ) that MOVING THE HS AROUND during
    application is NOT recommended.

    To get it right is not as simple as it looks. I did it three times
    before I got it running at a reasonable temp. The last way was exactly
    as specified in the FAQ.

    The coating must be VERY thin. Those pads are fine if you have a lot
    of thermal headroom. Most CPUs today are running near the edge w/o

    ALSO note that is you are using an AMD processor you must be VERY
    careful not to tip the HS while contacting the processor. The core
    will chip - I have two processors to prove it.

    Polishing the HS surface with 400-600 paper will also lower the temp a
    few degrees.

    It is like an auto transmission - every -degree adds to the life.
  3. Your language says all that needs to be said about you.
    The normal dielectric strength on the standard white heatsink compound, is
    18KV/mm. I just hope nobody here ever comes into contact with a piece of
    equipment designed by you.

    Best Wishes
  4. DarkMatter

    DarkMatter Guest

    Trust me, that is NOT why you ARE an insignificant wuss.
  5. DarkMatter

    DarkMatter Guest

    Dumbfuck. The stinger is ten inches long. If you knew ANYTHING
    about HV connectors, you'd know what a "stinger" is, but you are too
    fucking retarded. You call insulators "not 100% non-conductive"
    because you paid attention in class one day, not because you know a
    fuckingf thing about insulators.
  6. John Larkin

    John Larkin Guest

    For 99% of what I do, my 700 MHz Dell is plenty fast. The exception is
    simulation, either Spice or home-made stuff. For decent human
    feedback, you need to see the result of a change within a few seconds.
    I occasionally run into circuits that need 20 minutes to simulate one
    transient, so I'd like roughly 1000x what any Pentium can currently
    deliver. I'm simulating ion paths at 1 fs time steps, over a 500 ns
    flight, times 10,000 ions for a Monte Carlo thing, and it gets
    tedious. Things like Spicing oscillators can be equally bad.

  7. Your application is just an _ideal_ example of what my point
    about cpu speed means. Your simulation that takes 20 minutes
    would be reduced to 10 minutes if you can get a 100% speed
    increase. That won't make you satisfied, but it would certainly
    be "significant".

    On the other hand a 10% speed increase won't even be noticed,
    because you probably hit <enter> and go make a cup of coffee or
    something, and half the time may not notice when the job is
    finished for longer than 10% would shave off the time!

    On the other hand... a 4x increase in speed would reduce that
    run to 5 minutes. You can go get a cup, but you just barely
    have enough time to make a pot if that is required, and if so
    you won't get a chance to drink it. *That* is real

    My way of looking at it is that if some modification will give
    me 2x the speed, I'll do it if it is dirt cheap. At 4x
    increase, I'm interested if it doesn't mean essentially
    replacing the whole box. If I'm going to buy a while new
    computer, I want to see something like 6x the speed.
  8. John Larkin

    John Larkin Guest

    Yeah, something like 3-4x is worth an upgrade if you are really
    compute-bound enough to be annoying. I'd guess that few people are
    these days. Who needs speed? Game players and Spice simulation come to
    mind, maybe animation or something, too. Most PCB or mechanical CAD
    seems fairly happy at 700 MHz, although SolidWorks can get might slow
    painting or rotating a complex structure.

    I occasionally get a PDF page that takes minutes to view or print;
    very strange.

  9. CJT

    CJT Guest

    I think that's about right. I stuck with my 200 MHz Pentium Pro
    until the 1400 MHz Athlons became cheap.
  10. Previous generations, my rule of thumb was 3:1, but I waited more like
    your number last time. The difference just wasn't that important for
    most things.

    For things like CAD, the use of a fancy video card might be more
    important than the clock speed. They can cost more than an entire
    "2.4GHz" system.

    Best regards,
    Spehro Pefhany
  11. w_tom

    w_tom Guest

    My ballpark observation was that CPU speed has to increase
    on the order of 8 times for the human observed response time
    (for program execution) to double.

    A lack of multimedia demand in the late 1990s means that CPU
    speeds have gotten ahead of demand. IOW had broadband been
    available in late 1990s as the industry had expected, then CPU
    speed would have been a bottleneck. We are only into
    broadband today about where they expected us to be about
  12. DarkMatter

    DarkMatter Guest

    Sounds like you'd be better off writing your own sim for it.
  13. John Larkin

    John Larkin Guest

    Looking at the box that the Dow Corning 340 silicone heatsink compound
    comes in, it says "Not for human injection!"

    That limits its range of application a lot.

  14. Didn't you see that on the news a few years ago? Some so called
    "plastic surgeons" were injecting it into women to give them the shape
    they wanted. Since it wasn't contained, it moved around, and caused a
    lot of problems.
    20 days!

    Michael A. Terrell
    Central Florida
  15. Ian Stirling

    Ian Stirling Guest

    If it melts and runs out, you've put too much in, and it's just squeezing
    out the excess.
  16. als

    als Guest

    Awfully interesting. Reminds me of my old days in radio.
    Beryllium Oxide was the insulator of choice there.
    Is there a practical way to hard anodize Al in a home
    workshop (reasonally well-equipped)?
  17. John Fields

    John Fields Guest

  18. als

    als Guest

    Thanks for the URL. I nearly always learn something from
    another viewpoint, and I did this time also.
    I have done the types I and II (successfully!).
    What is the procedure for the type III?
  19. I think you need a chilled bath and relatively high current density
    for the hard anodize. Regular anodizing is pretty easy and the
    chemicals are relatively harmless compared to many plating operations.
    Caswell sells the supplies in small quantities.

    Best regards,
    Spehro Pefhany
  20. DarkMatter

    DarkMatter Guest

    That is not anodizing. That is referred to as "chem-etch", or
    "chem-film". Some versions have the appearance of an anodized piece.
    Unless externally applied electric currents are involved, it is not
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