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Quote Originally Posted by mcoffey View Post
Tell what I find the most facinating is the spread between 1.0 GPM and 2.0 GPM using the quad nozzle on your first graph. I read it as less than .6c improvement on the trend line. I would assume that's roughly the difference between all 3 pumps running full blast at approx. 2.0 GPM, and 1 pump running at 12v on the res top combo.

Unless I'm reading something worng, just goes to show that there's a lot less to be gained by adding multi pump regarding thermal performance than everyone is making it out to be.

Or am I reading something wrong based on your results?

Anyways, great approach and facinating stuff. Very valuable to the community I think.
You're reading it right.....seems there's only a .6C improvement from ~1GPM to ~2GPM.

And yeah, that's all three pumps at just under 2GPM and somewhere between 10.5V and 12.65V for the single Res Top pump for the 1GPM approximation. Each of the six pump settings I ran has its own dot along each line, though they might be a little difficult to see....maybe I should change that?

Anyway, w hat's even crazier is how much intentional restriction I have in my loop (so that I can get data at very low flowrates without having a variable amount of restriction, which I find harder to consistently do than variable pumping power): dual VL3 QDs, FM17 flow meter, two MCRs, ~9ft of 3/8" tubing, natural pump restriction when some are turned off, etc. The kind of flowrates I'm getting with the triple pump system is attainable with a single DDC3.2 if you do things right.

Of course this is just one block that has a bit of a reputation for being flow-agnostic, but as I get more blocks under my belt, it'll definitely be something to look out for and largely why I'm doing this testing

Coming from you, that means a lot to me...thank you