Originally Posted by skupples
i think you might also distort results due to having two different speed pumps running at the same time. are you shuttering one when testing the other?
draw a mental image of a faster pump pushing water into a slower pump, etc. i think the slower pump would just add restriction and not benefit flow much (yes, we know. redundancy!)
Yep, those numbers are one pump at the time.
I did run briefly both together with the DDC at lowest speed and the 2600 adds max 10 l/h.
Indeed I guess it's not the best running 2 very different pumps at the same time.
Originally Posted by war4peace
I have dual-D5 pumps in a volute and I can barely hear them. The 4x 230mm fans running at 400 RPM, those I can barely hear, but I can't hear the pumps (at 100%). BTW my flow rate is 313 L/h with the above setup.
Getting a weak pump because "others are noisy" is not backed up by actual facts, just saying.
It's on my list the D5, thanks for the feedback
I'm doing prototyping now and the Eisbaer LT just fits the task.
The DDC is indeed very noisy at full speed, it starts being noticeable at 2500 rpm and annoying at 3200 rpm; at full speed it's quite terrible.
And it's not even yet inside the case. The D5 seems vastly superior in every aspect.