Quieten my DDC or get D5?

Randall8686

Randall8686

Randall8686

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Afternoon all,

So i have fitted a NZXT Grid+ to all my fans and now my pc is near silent :D Why did i not do this ages ago. however i can now hear my DDC pump whiring away :( what should i do ? i can either slow it down with somthing like this
https://www.overclockers.co.uk/showproduct.php?prodid=WC-279-AQ

or replace it with a D5 with built in speed control ? or will a PWM pump work with my Grid+ ?

my res/pump is the XSPC D5 Photon 270 with DDC fitted directly to the bottom. (non PWM)

What are my best options ? the pump works a treat temps are amazing but during 30<% load its annoying me to hear the pump flat out.
 
its just got a single monitoring wire, the power comes from the molex. its part of my res bolted to the side of the case (on foam) its quite audible. my fans are totally silent at 40% hence hearing the pump i guess.
 
My DDC is on a foam pad and I attach the PWM to the CPU header. As I have a ROG board, I set the pump profile on the CPU header to 30% of speed up to 60c. Max is 80% over 70c. I dare not go higher because the pump will likely get too hot on the pad and burn out. Also my DDC gets very noisy, even with the noise dampening pad at high speed.
Heat and noise at high speed is the draw back of the DDC. I have bought a EK heat sink with rubber legs to improve this, but the noise side will not go away.
I recommend that you test limiting the pump speed to get the noise<>performance ratio that you like, otherwise a D5 is the other option.
 
Sorry, I did not read the post properly. Does your mobo allow you to control voltage through the CPU header or CPU Opt header? Its possible that you could slow it down a bit that way? I did a quick Google and I saw some posts where people talk about doing this. This might be worth exploring first.
 
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I would recommend getting a D5.

I tried the 18W and 10W versions, had the DDC on a fan controller and even bought the PWM versions. They just weren't quiet I tried everything with them.

To control the voltage you can use a molex to 3 pin adapter.
 
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I just leave it at the lowest speed. There was only a few degrees difference between setting 1 and 5.

The only time I needed to change the speed was to bleed the system.
 
I have 2 DDC pumps, 1x18W and 1x10W.... at 12V I can hear it a little bit, they are almost quiet and at 10V I cannot hear them at all, I keep them always on 10V.

18W on 12V = 4400rpm / on 10V = 3500rpm
10W on 12V = 3800rpm / on 10V = 3050rpm
 
Drangueos said:
I have 2 DDC pumps, 1x18W and 1x10W.... at 12V I can hear it a little bit, they are almost quiet and at 10V I cannot hear them at all, I keep them always on 10V.

18W on 12V = 4400rpm / on 10V = 3500rpm
10W on 12V = 3800rpm / on 10V = 3050rpm
Click to expand...

you're loosing quite some pressure. trust me i tested myself the 10W one. rpm isn't telling the whole picture. What you actually need is pressure.
i did a very simple test, connected 2 blocks and 1 radiator and modded the molex cable with resistors to drop the voltage up to about 9.5 or so. I could actually see difference in pressure.
I've got 2 blocks, 4 radiators, 2 pumps and 1 reservoir in the loop (d5 + 10W ddc)

the ddc is at full power and sits on velcro superglued to a thick (1cm) piece of rubber which is superglued to the case. Simple to do, ugly to look at, but holy moly, does the job. the ddc is quiet.
 
I've got 2 loops,
DDC 10W loop is res, pump, cpu block, 120 rad and 360 rad
DDC 18W loop is res, pump, 240 rad, 360 rad, 120 rad and 3 gpu blocks in parallel (so no restriction)

I've tested once and the temperature difference between 12V and 10V was almost none, I can see the pressure drop as well, but it is not affecting the cooling.
 
i haven't tested on my actual loop to see differences, though having 2 blocks and so many radiators will probably affect a little.

actually your second loop has quite the restriction in it. gpu blocks are pretty restrictive with the water flow, and drop pressure like a mofo. And you have 3 of them + 3 rads. You've got there some restriction. You may not feel it, but you have it :)
my loop is:
d5(bay reservoir), cpu, gpu, slim rad 240, rad 240, ddc, 120 rad, 360 rad.
 
ehm ... no, i have a vague idea parallel isn't actually way better
link
gonna quote Martin on this:
What about two or three GPU blocks in parallel instead of series?
Take the pressure drop for one and divide it by the number of blocks. A GPU block with a pressure drop of 1PSI at 1GPM will together in parallel with the same block results in 1/2PSI or 0.5PSI. Of coarse the flow rate through the GPU blocks is also similarly split so if you get 1GPM in the system, two parallel blocks will each get 0.5 GPM so take that into consideration as well. You can start seeing some GPU cooling degredation if you really bog down flow in parallel since it is possible to get it down in the .3GPM range.
Click to expand...
so as far as I understand it, there is not much difference between serial and parallel IF you have the flow.
 
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