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[Martinsliquidlab.org] Pump Noise Testing Round 1 - Page 3

post #21 of 35
Well, for one, DO NOT run the pump upsidedown. The pump will starve and die. Just turn your image 180 degrees right side up.

Second, to reduce noise in the RES top feeding the pump, you will need some open cell foam or a stiff plastic screen mesh held in place by an inner o-ring to prevent the swirling vortex of water from sounding like a kitchen blender making smoothies.




Edited by bmaverick - 3/24/11 at 11:07am
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post #22 of 35
I love you Martin
    
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post #23 of 35
Trying to decide between mcp655 and mcp35x. Can you help?
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post #24 of 35
Thread Starter 
Quote:
Originally Posted by HybridCore View Post
Trying to decide between mcp655 and mcp35x. Can you help?
The 35X is a bit more powerful and has PWM control, but the 655s(D5s) run much cooler if both are set fixed at full speed.

Noise is fairly close fixed, but the nice thing about thee 35X is when you set it up to speed up under load. I have one going right now that dials down to 30% PWM when doing normal office tasks and doesn't kick on 100% until I hit 42C core temps, so it's extremely quiet most of the time. Also dialing it down via PWM help the motor run much cooler.

I prefer the 35X as long as you plan to set up PWM dynamic loading on it. It's designed for PWM, so you should make use of that if you have it. You can also buy a sunbeam rheosmart to do the same for your fans and run both the pump and fan controller PWM off one 4 pin PWM CPU fan header for control. Works really good with the right software. If your motherboard doesn't come with anything good, I have found that speedfan can also take care of tuning.

Both excellent pumps though, hard to go wrong either way....but I REALLY LIKE PWM on the 35X after getting it set up..
    
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post #25 of 35
Hi Martin ..quick question ,i have noticed you didn't include combination of Koolance PMP-450S (D5 Strong)+ COV-RP450 Top in the test
What's your opinion on this combo?
http://martinsliquidlab.files.wordpr...ng?w=569&h=756
Thanks for the test
    
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post #26 of 35
Thread Starter 
I would recommend stock top only on the strong model. They spin fast enough that you can get vibration with some aftermarket tops depending on the pump sample. It could just be my particular samples, but I'm not sure.

The pump with stock top is already plenty strong enough, no need to add a top anyhow.

The strong is more for power than silence. It does pretty well, but I would rather run multple varios in series at slower speeds than one pump at really high speed if noise and power were both on the priority list.

Crossing my fingers they come out with a PWM strong, that would be a nice package also.
    
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post #27 of 35
I plan on running strong via DD Mansoon
P.S. i just cancelled COV-RP450 order after basic Mansoon show up @ DD
    
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post #28 of 35
Thread Starter 
Try it and let me know if you notice any vibration problems. I've seen a lot of variance in pumps lately, so I may just have one with an imbalanced impeller.
    
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post #29 of 35
it looks like x35 is louder past 2.2 GPM ,it may be a different story once installed in Mansoon (only one way to find out)
I appreciate you help
Thank you
Cheers
Eric
    
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post #30 of 35
I don't have experience with any other pumps to compare with, but my swiftech 355 with xspc dual bay res top has always made strange noises. For example, the noise coming from it is one consistent pitch for about 5 seconds, then it jumps up an octave for a couple seconds, then it either jumps up another octave or back down to where it started. Most of the time it alternates between one pitch and another every few seconds. It's very erratic and it doesn't seem to follow any sort of pattern, so it's very distracting and hard to ignore. Also, it's loud enough that I can hear it from a few rooms away even with a window open. Is this normal for a pump or do I have a lemon?
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