You've got to keep in mind that *none* of these pumps will come close to providing their rated flow when used in a water cooling setup--1/4 to 1/6 of the rated flow is, I think, a fair estimate. There's alot more restriction than you'd encounter in a pond or fish tank, which is what these things are designed for.
Still, you can have too much flow. I believe it depends on the surface area of the radiator, i.e., a smaller radiator benefits from lower flow, whereas a rad. with more surface area can handle increased flow.
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