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need replacement pump/reservoir combo (quiet and NOT 5.25 bays) - Page 5

post #41 of 43
Two different tests, and comparing noise at random flow rates in a super low restriction test loop has nothing to do with noise in real loops at the same flow rates.

Compare the 35X and D5 from the same tests

Kusanagi
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Kusanagi
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post #42 of 43
The OP has already solved his noise problems...

And in the 655-PWM review Martin says "The ambient noise levels changed by about 1 dbA between tests, so take that into consideration.".

I don't think you can compare noise measurements of different tests. Martin already did a round up comparing those pumps directly, that's the link I posted.

Edit: I didn't see Jakusonfire, I think we both mean the same.
Edited by cloppy007 - 10/13/13 at 11:23am
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post #43 of 43
I can say from direct experience, albeit experience with much larger pumps (30 - 1000 gpm), that pump testing is quite repeatable. Identical conditions should produce results with very little variation. But there's the key, identical conditions and no changes or updates in construction...... I picked the 1.5 gpm point as that's the midpoint of the range of what I'd expect to push thru a loop.....at least that's where I'd be setting the pump PWM setpoints to provide.

It just happened that the D5 hit a peak at 1.5 in the test I looked at. And while I agree with cloppy that 1 dBA is not something to concern ourselves with, Jaku's graph only reinforces my concern. In both tests, the D5 pumps have one or more peaks hitting 40 dBA in the range that one might use (1.0 - 2.0 gpm). It would appear based upon what we've seen in each of these sources, that the D5s have some sort of harmonic like condition where at a certain point on their curve , they have a very significant noise spike. Now yes, I agree that you may or not hit that spike in your particular system but it must be recognized that it's there..... and consistently there. It each of the three D5 pumps we saw spikes. We saw them at 1.1, 1.5, 1.9 and 2.4 gpm...... the 1st three concern me, the last one doesn't as it's not feasible that I might encounter such a spike in a system designed to flow between 1.0 - 2.0 gpm. The 35x has no such spike until we break 2.3 gpm .... a place I don't expect ever to be and therefore outside my concern. It would appear that using the COV somehow or another negates this peak somehow

The OPs problem w/ his first pump was almost certainly a defect. But given the evidence in the graphs, it is certainly possible that one D5 pump in any particular system could wind up hitting one of those peaks and a another D5 would miss it.

Finally, I'm sure you have seen newcomers to forums asking a question that get answered with "The search tool is your friend dude". Forum threads have a life beyond the solving of the OPs question. As I had just read one of those articles the previous day, I thought the OP might wanna file that info in the back of his mind ..... and others coming along later ..... would also benefit from it.

Many people go into water cooling for anticipated performance improvements. They are often disappointed. This "reviewer" used about $800 worth of stuff to lose thermal performance but he made a couple of bad assumptions and poor assumptions along the way



Where I am going with this is that with Haswell systems, I think WC has far greater potential for noise reduction than it does for performance improvements. I see many WC'ers, particularly ALC users, say "I don't care about noise. But for me, the OP and others, it has equal value to performance. The best way to avoid such issues is knowing where to look for the data. Certainly, most of the time you are going to be able to avoid those peaks, but if ya don't know that they are there, than makes avoiding them more difficult.
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911 Carrera
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1 x Swiftech 35x2 w/ Heatsink and NB Fan EK -MultiOption RES X3 250 White Acetal Reservoir 5 x PH-F140SP_BK_BLED + 5 x PH-F140SP_BK E22 Rigid 10/12 Acrylic Tubing and Bitspower Ma... 
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