[GigaFrog]

If you have a water cooled pelt, you know what will happen if the pump dies and you are away: peltier, water block, and CPU will fry, plus possibly motherboard and videocard.

How to avoid this?
A software protection can be set to turn off the PC if the CPU exceeds a given tmperature. The problem is that the PC is likely to crash before the software protection triggers. You can always back off the CPU clock, but then, what is the point of having a pelt?

The other solution is a hardware protection that will shut down the PC if the water block overheats. I implemented this solution in my computer, and it works great. I use a thermal switch found at MECI.com, part number 580-0203. The thermal switch is connected to the PS_OK signal from the PSU. If the temp of the water block exceeds 57°C, the thermal switch de-activates the PS_OK signal, which will result by an immediate shut down.

I tested it by applying a soldering iron against the thermal switch, and it worked almost immediatly.

Hope this will help someone (it helped me!).

Bye.