Cieprus came closest to a positive displacement pump (but it wasn't). Flexible rubber impeller, noisy as hell.
I've seen many peristaltic pump specs, but none were in the flow range that we use. They're mostly for dosing applications (i.e. deliver a specific volume, then stop).
I agree with you Brian: I wouldn't bother cooling anything else than a CPU with one pump; I'd get a second one.
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