Regulating pump speed - good, bad or just not important?

[Nutman]

Alright, fellas - I got a question for the hardcore water cooling guys out there.

I've been doing quite a lot of reading (for instance, see this: http://www.xtremesystems.org/forums/showthread.php?t=234698) about regulating pump speed. Usually, the main argument is that the pump would stop producing so much noise when there's no need for a high flow. Which, I guess, is a valid argument.

But then a friend of mine told me that when testing an old D5 (not the vario - the older one) he actually experienced that running that pump at a high speed, the resistance in the water loop would heat up the water - not just by a few degrees, but quite radically.

So, I was wondering if there isn't a certain balance - a certain flowrate - where the speed vs. cooling ratio is the most efficient.

Any of you guys done any research into that field?

[Spawn-Inc]

min flow rate you want is 1GPM, ideallly 1.5GPM and anything above 2 GPM is pointless for most blocks, some restrictive ones, like the cpu 350 from koolance, like more flow.


i wouldn't bother worrying about changing the speed of the pump personally, but thats up to you.

and + rep for the link as i just learned i could put a tach wire on my 655 vario!

[Kayin]

Sure, I've got switch mods on my DDC3.x pumps, so they can go from being 9w to 18w at the flick of a switch. Thought about putting pots on them. That's just being silly.