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#1
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Has anyone tried the KS 70 water cooling compact rig?
http://cgi.ebay.co.uk/ws/eBayISAPI.d...sPageName=WDVW
Looks neat, and 1 review recommended it to be solid peace of kit for £70. I have xp2500 with vulcan 9 which sounds like a jumbo jet when oc to xp3200. I want to oc it to xp3200 and hear the music and above. Will this kit handle that heat? Please advise as i have no knowledge of water cooling. |
#2
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2 words - barge pole. Don't touch it with ... Pump doesn't shift a lot of
water, fans don't move a lot of air. You'd be better off with an SLK heatsink and a 92mm fan - cost less than half the amount as well .... edek wrote in message ... http://cgi.ebay.co.uk/ws/eBayISAPI.d...sPageName=WDVW Looks neat, and 1 review recommended it to be solid peace of kit for £70. I have xp2500 with vulcan 9 which sounds like a jumbo jet when oc to xp3200. I want to oc it to xp3200 and hear the music and above. Will this kit handle that heat? Please advise as i have no knowledge of water cooling. |
#3
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A watercooling system is great for getting a lower CPU temperature; to
within a few degrees of room temperature. However, it is a very expensive choice for getting a QUIETER CPU cooling system. The particular water cooler you mention has some odd specifications, especially the air flow, 17.18 CFM, which is so low that you end up with less cooling than with more or less ordinary aircooled heatsinks which use more than twice the air flow. -- Phil Weldon, pweldonatmindjumpdotcom For communication, replace "at" with the 'at sign' replace "mindjump" with "mindspring." replace "dot" with "." edek wrote in message ... http://cgi.ebay.co.uk/ws/eBayISAPI.d...sPageName=WDVW Looks neat, and 1 review recommended it to be solid peace of kit for £70. I have xp2500 with vulcan 9 which sounds like a jumbo jet when oc to xp3200. I want to oc it to xp3200 and hear the music and above. Will this kit handle that heat? Please advise as i have no knowledge of water cooling. |
#4
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Thanks for the advice.
When choosing a cooling rig what sort of air flow parameters are optimal for modern cpu's? regards On Thu, 27 May 2004 23:21:49 GMT, "Phil Weldon" wrote: A watercooling system is great for getting a lower CPU temperature; to within a few degrees of room temperature. However, it is a very expensive choice for getting a QUIETER CPU cooling system. The particular water cooler you mention has some odd specifications, especially the air flow, 17.18 CFM, which is so low that you end up with less cooling than with more or less ordinary aircooled heatsinks which use more than twice the air flow. |
#5
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The short answer:
There is not really an "optimum" in the abstract. More is better. A better question is how MUCH air flow is needed to keep the temperature of the CPU below your target temperature. A compromise is made between how much noise is permissible, how high a CPU temperature is permissible, and cost. The long answer for air cooling: The CPU temperature can not be lower than the air used to cool the heatsink. The temperature of the CPU will depend on- CPU power consumption (which is all dissapated as heat, well 99.999999...%) Thermal resistance of the thermal compound and thermal resistance of the heatsink base and fins (not the overall thermal resistance of the whole system, which includes ALL these factors except the CPU power consumption and entering air temperature) Temperature of the air entering the heatsink Volume of air flowing through the heatsink Turbulence of air flowing through the heatsink (a moderate amount is best) Efficiency of heat transfer from the heatsink to the air (includes the turbulence factor) Air at room temperature and pressure has a heat capacity of about 24 Watt seconds per second per cubic foot per degree K (one degree Kelvin is the same as one degree C, but the zero point is absolute zero rather than the freezing point of water; when measuring temperature differences the results are the same in Kelvin and Celsius.) If a 20 degree C rise of the air temperature is acceptable, then a CPU dissappating 100 Watts of heat would require 24/30 CF per second = 24/30 X 60 = 48 CFM (at least.) If the air temperature entering the heatsink is 25 degrees C, the thermal resistance of the heatsink body and thermal compound is 0.05 degree C per Watt, then the BEST that air cooling can do given 100 Watts power dissapation 25 degrees C air temperature 0.05 degree C thermal resistance between the CPU and the heatsink fins 50 CFM air flow is 50 degrees C for the CPU temperature [(entering air temperature) + (thermal resistance X power dissapation) + (cooling air temperature rise)] = [25 degrees C + (0.05 degrees C per Watt X 100 Watts) + (20 degree C)] = [25 + 5 + 20] = 50 degrees C. If the power dissapation is less the CPU temperature would be lower, or a lower air flow could be used for the same temperature. Generally heatsink manufacturers give a thermal resistance specification that combines the effect of thermal compound, heatsink material, transfer efficiency, and air flow volume, giving a thermal resistance of something like 0.15 to 0.35 degrees K per Watt. For 100 Watts CPU dissipation and an entering air temperature of 25 degrees C, the corresponding CPU temperature would be from 40 degrees C(0.15 degrees C per Watt) to 60 degrees C (0.35 degrees C per Watt). There Ain't No Such Thing As A Free Lunch; the heat has gotta go some where, and the less air in this case, the higher the temperatures. Watercooling has a BIG advantage, by volume water has about 5000 times the heat capacity of air at ordinary room temperature and pressure. On the other hand, the same amount of heat that went into the water has to be taken out before recirculation, usually by air cooling, requiring at least as much cooling air as if watercooling had not been used. -- Phil Weldon, pweldonatmindjumpdotcom For communication, replace "at" with the 'at sign' replace "mindjump" with "mindspring." replace "dot" with "." edek wrote in message ... Thanks for the advice. When choosing a cooling rig what sort of air flow parameters are optimal for modern cpu's? regards On Thu, 27 May 2004 23:21:49 GMT, "Phil Weldon" wrote: A watercooling system is great for getting a lower CPU temperature; to within a few degrees of room temperature. However, it is a very expensive choice for getting a QUIETER CPU cooling system. The particular water cooler you mention has some odd specifications, especially the air flow, 17.18 CFM, which is so low that you end up with less cooling than with more or less ordinary aircooled heatsinks which use more than twice the air flow. |
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