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Martin's Pump Noise & More Testing Thread (Living Review)

post #1 of 11
Thread Starter 
New rules do not allow 3rd Party Sponsored Testing or Reviews.
Edited by Martinm210 - 12/8/12 at 6:13pm
    
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post #2 of 11
Quote:
Originally Posted by Martinm210 View Post
  • Noise Comparison & Mounting Methods, Metal Contact vs 1/4" Foam Decoupler vs. 1" Foam Decoupler.
How about a suspended test? I've never ran mine mounted to anything, so I'm curious to see how it compares.
    
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by just_nuke_em View Post
How about a suspended test? I've never ran mine mounted to anything, so I'm curious to see how it compares.
Like on a rubber band? That might work, and probably a good optimal test.. Good idea.
    
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post #4 of 11
Nope, just by the tubing. When I original mounted my res to the HDD cage, I figured I could just use a short piece and let the res hold the pump. This didn't work so good since the res keep slipping. I later turned the res sideways and added a rad on top. Everything sit in-place nicely now.
    
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post #5 of 11
I'm planning on making a bungee cord suspension for my pump, might be something to look into.

I've also heard that 3rd party tops make DDC's quieter, that would be something to test.
    
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post #6 of 11
love your work martin!
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post #7 of 11
Thread Starter 
Ahh..thanks. I will try that.

FYI

Oh...my.......

Heavy on the power consumption, but I like that 450S "Strong" PQ curve. In stock trim it even overpowers the 400 with a top. Noise on the strong is subjectively good too. Sounds like the 450 regular but a sightly higher RPM is all.




I also caught my Crystalfontz giving erroneous readings, but using a multimeter in Hz provided consistent RPM results, but it hopped in RPM +- 4HZ which is 120RPM. Sometimes the crystalfontz would use the high and sometimes the low. I may have to abandon the previous CFA based RPM data and retest those later.

Anyhow, pretty cool to finally see the strong in action.
    
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post #8 of 11
Thread Starter 
And here is the 12V comparison of the strong, it came in similar to the 450 at about setting 4.5. Power consumption is much lower here, so I'll be looking in between these two voltage settings as well.

    
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post #9 of 11
Thread Starter 
FYI, I've completed this family of PMP-450 curves to give you a better sense of the overall differences between the PMP-450 and PMP-450S:



If you're shooting for the 1+GPM mark for flow on a low restriction CPU only loop, you can see that a PMP-450 on Setting 3 is adequate and would only consume around 9 watts in power. However in a multi CPU/GPU/MB high restriction loop the PMP-450S would almost get there and would draw around 30W.

Also the PMP-450 at 16V is actually a fairly good balance between pumping power and power consumption. It's only consuming an extra 4-5 watts and acting like a setting 6 of sorts. There is however different RPM reduction going on. The Strong has a slightly steeper curve set when below 20 Volts.

There is a lot going on here, but with some practice it can be put to use..
Edited by Martinm210 - 2/14/11 at 6:30pm
    
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post #10 of 11
Thread Starter 

My first noise contribution. This was more of a trial in methods than anything, but I did find some interesting results.

I decided to test similar to fans with a fixed restriction amount. I ended up using a lower restriction cpu block + rad loop and then proceeded measure dbA vs noise vs RPM data. I also tested with the pumps sitting on a box of sheet metal to simulate the case metal flex noise effects to some degree and tested one decoupled thick foam scenario and one place directly on the metal box.

I compared:
NOISE - PMP-450 (D5 Vario) vs PMP-400 (DDC 3.25) + COV-RP400 top

I expected the PMP-450 to win hands down, but that's not what I got when looking at flow ratios. Sure the PMP-450 does dial down to a slower speed and net lower dbA level at it's lowest setting, but for like CFM levels the PMP-400 plus COV-RP400 actually did better. The trick was decoupling. It only did better when decoupled. When both were allowed to sit on direct sheet metal, they were roughly the same. So it appears the PMP-400 is a bit more sensitive to vibration transfer related noises.

Here is the video:


And the charted results:


Cheers!
Martin
    
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