This is actually not a good idea as it reduces waterblock efficiency. Before the heat ever goes into the water it goes to the copper. Then the copper heats up the water. By putting a hsf on the waterblock, it attracts heat away from the water and into the heatsink, thus taking efficiency away. OCH made a block based on the "pump failure" idea, and it was a horrible performer both due to adding the hsfs and just an overall shitty design. Xel, I like your idea though. I think a circuit attached to the power on/off button wires would be much better. Like to detect that if the pump no longer pumps, to shut down the PC. Surely in a quality watercooling system, if the pump fails, the PC has a few seconds before death...
-Kev
Here's maybe a better explanation. Think of how hot the top of your waterblock gets. Now stick a heatsink on it. Think of how hot that heatsink would get. Where would it send the heat? It wouldn't... It would just sit there on the heatsink and heat the block up more than need be.
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I used to throw hot coffee all over the ass of the horse there, then whip him while he was kickin' at me. Those f***in things are crazy.
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