Originally Posted by lohoutlaw
I think i can answer that one!
Setting up pump to CPU block can add access heat to your CPU block, for i have noticed the the pump puts off heat into water for working so hard.
As for the pump to radiator to CPU. This gives the water time to cool before entering the CPU block.
Ok I ask the question only because factually no matter how loop is set up the temp differences can't exceede 0.05c in the loop.
By setting it up as this stickie suggest you can actually get higher temps if you are forced to use more tubing to acheive that specific set up sequence or if it causes more tubing bends which would slow the water flow.
When people say putting the rad after pump lowers temps I doubt there really thinking it through,because the idea although on the surface makes sense it leaves out a criticle factor.
The water is in constant motion,It never stops,and depends completly on motion to be effective.There is such a tiny measurable difference in water temp when water flows past cpu block to gpu block that it would take lab quality equipment to measure the increase.Lets take an example you can test your self.
Take a candle and move your palm over it fast then do the same only move hand slow.OR better yet stop totally over the flame for a second.You will feel in the latter 2 instances a increase in temps however when you move it fast over the flame you will feel little or no change in heat applied to your hand,NOW do all 3 experiments over and over again..notice the faster you move your hand how long it takes to get it to feel unacceptable hot.This is the principle on how water in a closed loop works..Now add a rad and the water moving fastest picks up the same heat as the slow water but it displaces it faster because each water molicule is in rad more often because of the higher flow.
Now I suggest if setting the system up provides LESS tubing and LESS bends in tubing by following the suggetions in his stickie then do it.However if putting rad before pump as its inlet supply results in a better tubing arrrangment do it that way because the chance you may get a 0.05c lower temp will have 100% Zero effect on systems ability to overclock and your ability to measure that miniscule amount of difference.