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New MCP35X - Less Noise, but still noisy

post #1 of 8
Thread Starter 
I've just been confirmed by my retailers that my previous MCP35X pump was in fact broken.
The one I asked about here: http://www.overclock.net/t/1299801/swiftech-mcp35x-noise-problem

Anyway, I've received my new MCP35X and it's making the same kind of noise, just less.
Is this another RMA pump or is this sound realistic for this model?
http://www.youtube.com/watch?v=CSiwl3sAnaE

The pump has never been running dry in the system. It's powered by the MOLEX, not the 4 pin fan thingy, which is not plugged in at all. (Forgot the name)
I've been bleed/leak testing it for around an hour now.

Thanks a lot in advance!
post #2 of 8
the sound is normal for a pump that is not properly decoupled from the case, as yours is not. first thing is lift the pump up in your hand, that is the true noise. neoprene pads do not decouple the pumps from the case, they transmit vibrations very well. Also put your finger next to where pump is attached, if feel any vibration of case next to pump, again not decoupled.

petra gel (tpe gel) or shoggy sandwich with soft sponge/memory foam in middle are 2 ways to decouple a pump from case. tpe gel attached with tape/velcro is best (a single screw through gel to case will increase noise and defeat purpose.

If you want quiet pump that cant be heard above 600-700 rpm fans, get d5s with metal housing, run on setting 4, and decouple with tpe gel.

If you want fairly quiet pump that cant be heard above 1000 rpm fans, get mcp35x and decouple with tpe gel.
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post #3 of 8
You can slow down the pump easily w/ Speedfan if you connect the PWM to the motherboard header. You can more than likely drop the speed down to ~ 2000 rpm w/ little affect on water temperatures.
post #4 of 8
I have two MCP-35X on a Koolance RP-402x2 and when they are running at 100% (~4500 RPM) they are loud. But the whole point of the MCP-35X is that it is a PWM pump.

The default of not hooking up the RPM sensing / PWM control lines is the pump runs at 100%

In both videos you do not have the PWM/RPM cable hooked up, so it is running at 100%. As Lowfat said, hook this to a PWM controller or your CPU fan header and slow the pump down. I run mine at 1200 RPM when idle and only at CPU / GPU max load do I go above 2800 RPM. These pumps are silent at lower RPM, which is where you should run them when not under load.

If you want a pump at 100% full time, you bought the wrong pump. Get a D5 or MCP-355 series, but they have lower performance at max RPM in exchange for silence.
 
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post #5 of 8
That pump is probably running hot as hell with no air circulation and on full blast.
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post #6 of 8
I have 2 mcp35x on a Koolance res. At full blast (6K rpm) they are a bit loud. Martin's optimizer indicated that for 1GPM I could run these just above 30%. At that speed I can't hear them in a quiet room.
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post #7 of 8
I really wish that I went with an mcp 35x. My 355 is easily the loudest thing in my pc.
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post #8 of 8
Buy the heatsink, and you get two very beneficial items: 1) the heatsink, which can drop pump PCB temps by 35-50 percent, and 2) screws that serve as stands and also have rubber feet you can attach to quiet the pump.

Also, mounting the pump directly to the case means that you need to use rubber washers on both sides of the metal that prevent the screw from actually touching the case, it should only contact the rubber. Any hardware store will have grommets in dozens of widths and diameters so that you don't actually need washers, and the grommets will isolate the screws better as literally every bit of metal will be covered.

Finally, PWM is a huge benefit of the 35X, the other being the top, and it makes little sense not to take advantage of this feature... I would bet that upon starting PWM control, the pump stays below 50 percent speed 90 percent of the time.
   
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