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Thread: Temperature problem .....

  1. #1
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    Temperature problem .....

    Hi Everybody!

    We did our first run with dry ice yesterday, but we found ourself against a serius problem.
    The CPU idle temperature could not fall under -25 °C .The ice temperature was about -60°C.

    The container was made of brass ( not copper) .Can it cause the problem?
    Or can can be the rise of the problem that the thick of the support is only 4mm?
    We used alcohol too , but we didn't know the quantity .

    Can anybody help plz?

    Thanks.
    Asus commando***Q6600@3600MHz(1.34V)***Sietec DDR2 667@1180MHz(2.3V)***Gainward 8800GT 512MB GPU 1.3V 840/2100/2200***Razer Diamondback***Viewsonic VX2255 22"

  2. #2
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    Brass has a pretty poor thermal conductivity which is probably one of the main problems. (Brass - 69.33, Aluminium - 136, Copper - 231)
    Also sounds like you may have used too much alcohol i'd expect ice temps in the -70's unless your thermometer was inaccurate.
    Pentium M database:
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  3. #3
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    plz use at least aluminium or you won't be able to do nothing, if you want take an heatsink an solder on it a tube,it will work good
    don't make tha base only 4mm thick,it won't handle good the load, use at least 1cm
    good luck for your next bench

  4. #4
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    Thanks guys for the fast answers!
    We will do an another tube , made of copper , and based on 1cm thick support.
    Asus commando***Q6600@3600MHz(1.34V)***Sietec DDR2 667@1180MHz(2.3V)***Gainward 8800GT 512MB GPU 1.3V 840/2100/2200***Razer Diamondback***Viewsonic VX2255 22"

  5. #5
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    Do you have any pics of your brass tube? What are the internals like?
    Also what kind of load temps did you end up with or did you not try?
    Pentium M database:
    http://www.wwwwwoc.net/db1.htm

  6. #6
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    Its nature , not polished (I haven't got any closer pics of it) . The wall of the tube was about -45 °C.
    The load temps was about between -5 °C and 0°C .(P4 3.73 Extreme Edition/5300Mhz) .
    Asus commando***Q6600@3600MHz(1.34V)***Sietec DDR2 667@1180MHz(2.3V)***Gainward 8800GT 512MB GPU 1.3V 840/2100/2200***Razer Diamondback***Viewsonic VX2255 22"

  7. #7
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    Here is a pic of the tube .Its not a good one , but i think You can see the inside of the tube.(The tube fixed on my DFi Ultra-D) http://img.tar.hu/dermedt/img/19228384.jpg#3
    Asus commando***Q6600@3600MHz(1.34V)***Sietec DDR2 667@1180MHz(2.3V)***Gainward 8800GT 512MB GPU 1.3V 840/2100/2200***Razer Diamondback***Viewsonic VX2255 22"

  8. #8
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    Use copper on the next one and use acetone not alcohol. Do thqat and you're set.
    Phenom II 940 BE / ASUS M4A79 / HD5770 Crossfire
    3770mhz CPU 2600mhz NB | DDR1040 5-5-5-15 | 900/1250

  9. #9
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    Thanks for helpin' !
    Asus commando***Q6600@3600MHz(1.34V)***Sietec DDR2 667@1180MHz(2.3V)***Gainward 8800GT 512MB GPU 1.3V 840/2100/2200***Razer Diamondback***Viewsonic VX2255 22"

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