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Pump Noise

post #1 of 9
Thread Starter 
Hi, I have just gotten to setting my loop up and I find that my D5 Vario pump makes a constant high pitch noise. It gets a tiny bit less audible on the way from setting 5 to 2, but not until 1 does it finally become "bearable"

By no means is this high pitched noise "loud", im just very sensitive to it.

1 - Is this normal?
2- What can I do about it?
3- Is a MCP655 PWM or MCP35X going to be better in this regard?
4- Would going dual pump on a twin bayres allow me to run both at 1 [or on an MCP35X, low%] while retaining a reasonable flowrate and less noise than 1 pump? Which is best for dual pump?


My loop is 540mm rad > CPU > GPU > Bayres/Pump > 540mm rad.

In the future I might put a rad in between CPU and GPU.
post #2 of 9
It could just be air trapped in the loop making its way through.
Once the loop is thoroughly bled, pump noises should virtually disappear.

If you can tip your case back and forth, side to side, and still see a lot of small/micro bubbles, that could be the reason.

Otherwise the only thing I could think of would be vibration transferred into your case depending on how your pump is mounted.
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post #3 of 9
Thread Starter 
I should have mentioned in the OP - its currently just the blocks and rad, etc, leak testing outside the case ATM. So, no mount.

There is definitely still air in the loop, but the main noises are gone. Most of what I hear is an occasional bubble escaping, and the constant whining.

Its a lot like an old tube TV whine.
post #4 of 9
the pump didnt run dry at any point, did it?

I have MCP655 and no whine at any speeds
it DOES have a slight frequency based noise at some speeds, but that is doe to "bad" mount to the case.. nothing to do with the pump rly thumb.gif
 
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post #5 of 9
Thread Starter 
Not that I know of, it was not run dry.

Are you sensitive to the noise old CRT TVs make?
post #6 of 9
yes, and not only old CRTs.

I often hear high pitched noises that my friends doesn't.. I did a LOT of research when I ordered my PSU, due to coil whines (witch I had heard can happen with a lot of PSUs now a days frown.gif ) but guess I got a lucky one ^^

but my GPU has a slight whine when I use full load with folding at home :S , and only I can hear it.

us with the good hearing is cursed I guess -_- cant wait to get old and loose the ability to hear those high pitched noises, hehe tongue.gif

I would go with the MPC655, great pump!
 
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post #7 of 9
All my D5s have had pump noise of varying amounts usually at setting 3 and above. Fully bleeding the loop should normally get rid of most noise.

PWM controlled pumps give you the option of running them at a very slow and quiet speed when the system is under low load and then ramp up as the load increases. However in the case of the 35X it will be a lot louder at full speed than a D5.

If you're sensitive to noise avoid any Bay Res that has a D5 or DDC/35X mounted to it unless you have the option of isolating the res from the case.
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post #8 of 9
Thread Starter 
Thanks guys. I also had a LOT of issues getting a quiet PSU tongue.gif

Would it be a good idea to get rid of this current Pump/Res combo and go for two pumps, one with a res [Like MCP35X tube res]? I mean, I havent set the system up yet so I dont know if setting 1 or 2 is actually enough for my loop, but I'd venture to guess no.

If anyone has experience with 1 versus 2 pumps, can 2 pumps on low settings produce less noise while making the same/similar pressure/flowrate? I know this is the case with fans, but only if they are individually mounted and not on top of each other where only pressure changes. IDK how this works with a pump.
post #9 of 9
Thread Starter 
Well it turns out at setting 1 and a passive radiator, temps are still very good. Only running 4.5GHz @ 1.374v actual, and its hitting 60c. Compared to my Xigmatek HS before, that was >75c and loud smile.gif

However the idle temps were a lot better before.

-- [Actually creeped towards the 70s where I stopped it]

For ****s and giggles, I lay down the radiator over my rooms AC vent. Temps quickly dropped all the way down to just about 40c and then I got BSOD. Even at those low temps my 3820 sucks. 1.375v and it cant do 4625 :/
Edited by Derpinheimer - 8/8/13 at 5:26pm
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