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Originally Posted by mtbdrew
Not sure what you mean by iirc.
I know from experience that my XP3200 adds about 70 watts, translates to about a 8C rise in temp from room temp to give 31C CPU temp.
My 6800GT is adding about the same with the DD NV68 block (GPU and mem) and the temp goes from 31C to 47C GPU temp.
If I where to run this into another video card then that one would be getting water at a temp of 47C.
This is what I've seen on my setup or am I missing something? The ambient temp reported by video card always matches the temp reported for my CPU.
I realize that the water is constantly flowing and being cooled through the rad. However, the heat still has to add up the more stages you put in and the greater the distance the water has to travel before getting cooled again.
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iirc = if i remember correctly.....
at (say) 4 litres/minute (just over 1 US gallon/minute and a low flow rate for a system) once a steady state is reached (i.e. the water temperature has risen to the point at which the rad(s) shed heat as fast as the pump+blocks add it) a 70 watt CPU would only raise the water temp by approx 0.25C i.e the temp
after the block would be a quarter of a degree higher than that
before it.
{specific heat capacity of water is 4.186 joule/gram °C, 4 litres of water weighs 4kg so 66.667grammes per second flow through the block. therefore since a watt = 1 joule/second it would need about 279 watts to raise the water by 1C}