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D5 and DDC

post #1 of 21
Thread Starter 
If i want the quietest pump possible, which pump should I go? MCP355 or MCP655?
Edited by yuhaowu - 6/12/11 at 4:40am
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post #2 of 21
I haven't had a DDC although I do have a 35X. The 655 is quieter but the 35X isn't especially loud but does have a high pitched whine at full speed. If you're using quiet fans then you'll hear it at higher speeds. If your fans aren't that quiet then you may not hear it over the fan noise.

Using PWM on the 35X does mean that you can set it to, say 30%, when the system isn't under load and it's very quiet at that level and then ramp up the speed as load and temps increase.

I have found that even with the speed at a constant 38% loads temps increase no more than 1ºC compared to running it at 60% (which equals full speed as it doesn't get much faster than that if you increase it beyond 60%).

The base of the pump does get hot and I've added a heatsink and fan blowing directly on to it. Swiftech do a heatsink unit for it as well.
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post #3 of 21
    
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post #4 of 21
Its the "Fully Decoupled" that makes the difference, even the D5's hum if you attach them to anything. If your going for a really silent system I'd recommend them floating on foam/gelstuff with an aftermarket top.
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post #5 of 21
If it's any help the noise levels I described above are with the 35x suspended from the tubing and not touching any part of the case. For the 655 it was with it partially suspended from the tubing and just lightly resting on thick soft foam.
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post #6 of 21
Ooooo I like that graph... Martin again ofc, is there any graph on here he hasn't done xD

But with that graph, keep in mind that you are unlikely to get above 1.5 GPM flow with the restrictive water loops we all have.
    
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post #7 of 21
Thread Starter 
Hmm, from that graphy i see that pmp450 is lounder than ddc when its flowrate is at 1.1 but is quiter than ddc when flowrate is at 1.3 and 1.5+.... Hmmm
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post #8 of 21
Thread Starter 
What is the most common flow rate for a water cooling loop??
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post #9 of 21
The DDC-1 is really that loud? I always thought it was supposed to be one of the quietest pumps on the market. According to that chart, it's the loudest?!
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post #10 of 21
Quote:
Originally Posted by elemings View Post
The DDC-1 is really that loud? I always thought it was supposed to be one of the quietest pumps on the market. According to that chart, it's the loudest?!
There was a big improvement to Laing's circuitry between the DDC1/2 series and DDC3 series pumps.

A DDC 3.1 or 3.15 is what replaced the old DDC1 series, and they are very quiet. But the DDC1s are more buzzy.

Not talked about much but there was a noise change improvement with the DDC3 series pumps.

As far as DDC vs D5s of current generation, at full speed the D5s are quieter, but mounting/decoupling is the greatest factor. Unlike fans, pumps transfer vibration something fierce. Solid mounting a pump is a good way to make any an obnoxious pump speaker...

The twist that comes into all of this is dynamic throttling of pumps like the 35X with PWM control. It can give you sort of the best of both worlds, silence 99% of the time and top end DDC performance only when needed.

After having PWM setup on the 35X, I don't think I could ever go back to a fixed speed pump.... I run PWM temp controls on both pump and fans now and in pure silence bliss.. Reduced my ambient office noise levels from 42dbA to 35dbA.
Edited by Martinm210 - 6/12/11 at 9:34pm
    
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