Quote:
Originally posted by pHaestus
Is there any physical basis for what you are proposing? I have never heard of such...
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Sure is, its called block design. One block design could perform better given the right circumstances than a different block.
So in the example I have given, WaterBlock-A might have a fast flow rate (Maze-3), while WaterBlock-B has a slower flow rate (Innovatek3). So give the constant water temp coming into the block (Say Room Temp of 70 degrees), the higher flow block would have a temp closer to the water coming into the block. While the slower flowing block would have a higher initial heat (as the water isn't moving fast enough to keep the block as cool).
In a closed system (like the real world) with a radiator, the temp of the water will increase with the heatload generated by the CPU. Now because of the design of WaterBlock-A (fast flow, low water resistance - read less surface area), the water flows so fast that it doesn't have time to absorb all the heat from the CPU. While WaterBlock-B with it's slower flow rate (yet higher resistance - read more surface area) can release more of the CPU's heat into the water.
This is where a good radiator comes into play. While WaterBlock-A's fast flow actually hinders the effeciency of the radiator, the slower moving WaterBlock-B gives the radiator more time to remove the heat. This is also why you see people needing larger radiators (Big Momma, etc), to keep WaterBlock-A cooler.
Thus as the water heats up, WaterBlock-A actually performs worse than WaterBlock-B. But in your tests, you wouldn't be able to see this result as you would just see WaterBlock-A keeping a lower temperature. Again, this is why I stress realworld examples vs. Lab testing.