The whole slower is better thing is obviously wrong. A very simple example (based on krazy's): If you run it at a given speed you pick up 1 unit of heat in the block and dump 1 unit in the radiator. If you then halve the speed you can now dump 2 units in the radiator (more or less, I've simplified it for clarity). Great, twice as good you think. Wrong. You also pick up 2 units of heat in the water block. The upshot of this is that your waterblock is hotter than before because the water in it picked up 2 units of heat instead of 1. Thus your cpu runs hotter with a slower flow. Once you start also adding in turbulence effects of higher velocity water you see that slow flow is really bad. And the final nail in the coffin is that with restrictive tubing your pump has to work harder to push the water round the loop meaning it will tend to run hotter which further degrades your cooling system.
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