@ Khanh:
The old CPUfx pump is a bilge pump: a submersible pump which was designed to get any leaking or waste water inside a boat hull, well, outside the boat hull. As such it has not much pressure behind it, and is not continuously rated. Hence it's crap for watercooling.
@ Ambient:
You're right about the Eheims. No pump is better than an Eheim (IMNERHO). Nevertheless, my trouble with a mains pump, even if rigged to switch on with the computer, is that you're stuck to a particular mains voltage. No switching from 110V to 240V and back at the flick of a switch on the PSU. Small consideration, but still...
@ PuNiSh3r:
A 12V pump can perform the same as a mains powered pump. Voltage alone is not the issue. We all know from science class that P = V x I (Watts = Voltage x Amps). So a 12V pump could just use more amps. This is why Pelt systems, even though running on only 12-24V, still need a seperate supply that can give you a nasty shock. Besides that pumps differ in design and efficiency. It is not a straightforward equation...
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