I'll second that. The pump may generate heat but many pumps can't handle loads of heat. with the setup you describe the hot water from the cpu is going into a reservoir to sit with the pump. I suppose the optimal configuration in spite of that would have 2 radiators one not needing to be able to dissapate much heat.
like this for example:
pump-small radiator-cpu-larger radiator-repeat
this would generate optimal results, however, it requires 2 radiators. The life of the pump will be prolonged by cooling the water before it enters the reservoir. I recommend putting the radiator immediately after the cpu due to the facts that the heat from the pump won't affect core temps much, if at all, and that the pump won't live in as much heat. However, in a non reservoir, closed system, it doesn't matter much where the radiator is, because the pump isn't adding to the temperature of the water, nor is the pump affected by the temp of the water.
--MAtt
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