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can some one explain "delta T"

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Delta is shorthand for a difference. T is temperature.

Delta T = difference/change in temperature. Lower delta T is better, if you are talking about the difference between room temperature and CPU temperature.
 
About the procooling graphs.

ProCooling said:
A word of explanation about the following graphs may be helpful. I measure CPU diode temperature, the temperature of the water at the waterblock's inlet, and the water flow rate. By plotting the difference between CPU temperature and water temperature, we can normalize all testing. This is required because water temperatures may vary from day to day in my testing room. The closer that this delta T (engineering-speak for temperature differential) is to 0, the better the waterblock is performing.
 
delta T means the difference of temperature between cpu temp and ambient (room) temp. If the block has good design, it should cool the cpu well so that the cpu temp is lower (closer to room temp) therefore delta T is low. If the cpu block is inefficient in cooling the cpu, then cpu temp will be higher and thus delta T is higher. Hope that clears it even more.
 
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