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Originally Posted by Dave
Bob, are you suggesting a HPPS is even quiter then a MAG or a proper running 1048?
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I'm suggesting that it's quieter than a properly running 1046, which is marginally quieter than a properly running 1048.
I can't make a comparison to a MAG as I haven't used one (busy with "my other life" and haven't been particularly interested in building PCs for friends lately).
It
does vibrate a bit (as do the other Eheims), so it's actually noisy if you just put one on a bare case floor. The vibration seems to be perpendicular to the rotor axis (possibly true of all centrifugal pumps?) so it's particularly good at putting vibration into a sheet metal panel it's sitting on - sort of like a kid on a swing pumping h/h legs.
On a foam pad and pumping through soft silicone tubing (again, for vibration isolation) I have to put my hand on one to see if it's running (even in the dead of night in winter - low ambient noise).
However, the low noise comes at a price - relatively low performance and high price.
The MAG, by comparison has much better performance and lower price - and it must be quiet enough that your OEM customers aren't pushing for "quieter yet". You've also got a form factor that would
probably let you damp any vibration more easily by changing the mount orientation.
I find vibration (and its abatement) an interesting area as I was (long ago) a motorcycle mechanic. Of course, the difficulty there was countering linear vibration with rotational action - which isn't a problem here at all. IMHO
very interesting stuff, even now - but also
very off-topic for pro-cooling...
To get back to the pumps, the Eheims like to be on soft thick foam pads as it's vertical vibration that needs to be damped. Heavier materials like neoprene and sorbothane that
feel like they'd do a better job do not. I'd theorize that this is because those materials are better at damping side-to-side vibration (so wrong axis).
Suspension would probably work very well - but I haven't tried it.