Water Cooled G4 MDD

Discussion in 'Macintosh Computers' started by Gymnut, Sep 10, 2003.

  1. macrumors 68000

    Gymnut

    Joined:
    Apr 18, 2003
    Location:
    Hawaii
    #1
    Not sure if this has been posted before but for those who have not seen this from xlr8yourmac.com, there is development for a water cooling kit for the G4 MDD. While this article was posted in April, it is interesting to see whether it is closer to reality or been scrapped. Anyone familiar as to what if any speed gains one might achieve by installing a water cooling kit? I know heat buildup is a problem but is a water cooling kit merely for show and less noise or does it actually have some real world use.

    http://www.xlr8yourmac.com/systems/watercooled_MDD_G4/watercooled_mdd_g4.html
     
  2. macrumors 604

    MacBandit

    Joined:
    Aug 9, 2002
    Location:
    Springfield, OR (Home of the Simpsons)
    #2
    Re: Water Cooled G4 MDD


    Watercooling has nothing to do with performance unless you plan on overclocking you machine in which case it does provide better cooling. What it does do though is allow you to run your machine much much quieter in most cases.

    Last I knew this kit was available but they didn't have one for a dual cpu model. Also I requested info on an external kit as I have both my optical bays filled. At the time they had no plans for either. Too bad really.
     
  3. thread starter macrumors 68000

    Gymnut

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    Apr 18, 2003
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    Hawaii
    #3
  4. macrumors 604

    MacBandit

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    #4
    That would be cool but the photos are of a single processor rig. Go figure?:confused:
     
  5. macrumors 603

    rainman::|:|

    Joined:
    Feb 2, 2002
    Location:
    iowa
    #5
    alternative cooling, such as mini air-conditioning and watercooling (they're about the same thing, minus a blower), is used almost exclusively in overclocking. as was said there's no performance boost, and it's just a noise thing, people don't usually go to the trouble for the sake of noise-- plus, some of these cooling setups can be noiser than normal fans. overclocking's main restriction, besides chip instabilty, is heat, so if you find an effective way of removing it, you can go higher.

    i remember seeing a cluster of experimental PPC prototype machines on loan from IBM in an unnamed government research lab, this was a few years ago. They had cracked the cases off of 'em and wound up with aquarium air pumps blowing on the processors, just to keep them from melting. it was pretty weird... i think they were getting ready to put in a large-scale water cooling system.

    of course, liquid is better at removing heat, since it's much denser molecularly... more molecular interaction means more heat exchange. Since mineral oil doesn't conduct electricity, you can just submerge your motherboard in it, if you don't mind having a tub of oil sitting there with wires snaking out... you don't even have to move the oil around, convection keeps it that much cooler than big fans would.

    pnw
     
  6. macrumors member

    Joined:
    Sep 5, 2003
    #6
    Does anyone of you know why raising the core voltage of a CPU helps in overclocking ?? I understand the multiplication thing, but, I often see that someone was only able to overclock his CPU when he raised the voltage to 1.9, or 2 V , etc... I plan to, maybe, overclocck my dual 1.25 to 1.33, or maybe more... so i'm interested to know more about that and watercooling too !!
    thanks
     
  7. macrumors 6502a

    Phatpat

    Joined:
    Jun 15, 2003
    Location:
    Washington DC
    #7
    I'm pretty sure you need to increase the voltage because as you overclock and the processor gets faster, it needs more power to remain stable.
     
  8. macrumors 65816

    blue&whiteman

    Joined:
    Nov 30, 2003
    #8
    keeping a machine cool only means it will run at its full potential so you're not really making it faster, just letting it be all it can be :) a hot cpu won't perform at 100%

    I have discovered the wonders of silver thermal paste. I swear by it!
     
  9. macrumors 604

    MacBandit

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    Aug 9, 2002
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    #9
    As you clock it faster and faster the resistance in the circuits becomes a larger and larger problem. So you increase the voltage thus overcoming the resistance.

    This will work in some cases but you also need to increase your cooling due to the extra heat brought on not only by the chip running at the higher frequency but also the higher voltage.

    This can also lead to the premature death of the chip due to material transfer at the atomic level. If you don't know about this then you aren't ready to be doing this type of overclocking and need to read into it more.
     
  10. macrumors member

    Joined:
    Sep 5, 2003
    #10
    that is exaclty what i'm doind now :)
     
  11. macrumors 6502

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    Tampa FL
    #11
    FWIW, I water cool my main PC because the fans required to keep it cool were too damn loud. I keep the others PCs off when not in use. My two macs are relatively silent, so they are a non issue. But I don't have a windtunnel mac ;)
     
  12. macrumors 604

    MacBandit

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    #12
    For anyone that uses a PC regularly the noise out put of the wind tunnel Macs are greatly over stated.
     
  13. macrumors 6502

    Joined:
    May 27, 2003
    Location:
    Tampa FL
    #13
    Well the point that I didnt make very well was: Although I watercool my PC, it is only to reduce sound. I do not overclock it at all. I do use a Quicksilver Mac at work and it is louder that the (desktop) PCs next to it, but in a busy office enviorment it all blends. In my home I want my computers quiet.
     
  14. macrumors 604

    MacBandit

    Joined:
    Aug 9, 2002
    Location:
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    #14
    I agree completely. Water cooling is a very affective way to quiet a PC or Mac.

    In my experience top of the line PCs those running high end graphics cards with large power supplies fast hard drives and a high end processor are every bit as noisy as the newer PowerMacs.
     

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