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Water pump with or without speed control?

post #1 of 47
Thread Starter 
Just ordered a Swiftech MP655 pump with no speed controll. Should i=I return it and get one with speed control?
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post #2 of 47
Can you link what you ordered? I think you'd definitely want to be able to control the speed, because full-speed is very loud.
 
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post #3 of 47
Thread Starter 
Quote:
Originally Posted by CattleCorn View Post

Can you link what you ordered? I think you'd definitely want to be able to control the speed, because full-speed is very loud.
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post #4 of 47
I would absolutely return it. The B model is much less powerful at full speed compared to the Vario, and an important part of the silent running of D5's is finding a speed that each individual impeller likes to run at. They are balanced at the factory much like car wheels are and certain speeds can cause much more vibration than others.

This chart shows how they can go from quiet at low speed, through a louder intermediate speed and quiet down again at full speed. It is important to be able to find a good speed for each pump.
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post #5 of 47
Thread Starter 
Quote:
Originally Posted by Jakusonfire View Post

I would absolutely return it. The B model is much less powerful at full speed compared to the Vario, and an important part of the silent running of D5's is finding a speed that each individual impeller likes to run at. They are balanced at the factory much like car wheels are and certain speeds can cause much more vibration than others.

This chart shows how they can go from quiet at low speed, through a louder intermediate speed and quiet down again at full speed. It is important to be able to find a good speed for each pump Warning: Spoiler! (Click to show)
.
[/quote



Wow.. Interesting, thank you for that. REP+. Hopefully I can return it, I had it sleeved. Snaps.. There goes $100 down the drain if I can't exchange it.

Edited by WiLd FyeR - 5/31/13 at 2:35pm
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post #6 of 47
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The fan connection pin or not sure what you call it. Noob. What is that for? Is that just to show the RPMS or something?

Also regarding heat, will there be any difference in the water temps depending on the speed?
Edited by WiLd FyeR - 5/31/13 at 4:02pm
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post #7 of 47
Quote:
Originally Posted by WiLd FyeR View Post

The fan connection pin or not sure what you call it. Noob. What is that for? Is that just to show the RPMS or something?

Also regarding heat, will there be any difference in the water temps depending on the speed?

Yes,,,

Just to give you an idea I hooked up a test loop to check that a reservoir didn't leak at all and the loop was a cpu block, 240 radiator, res and the pump no fans no components just out in the open plugged into a test PSU and overnight it got very warm.

I have more experience with the DDC pumps and can say that if I run my system at 100% PWM vs a lower setting the temperature will go up.

I would vote that you return it and get a PWM pump you won't regret it.

I would venture to say the pump would last longer from running at a lower speed to but that is just speculation. Def the more power going through the pump the more heat.
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post #8 of 47
Quote:
Originally Posted by WiLd FyeR View Post

The fan connection pin or not sure what you call it. Noob. What is that for? Is that just to show the RPMS or something?

Also regarding heat, will there be any difference in the water temps depending on the speed?

Yes the 3 pin fan connector is only for RPM monitoring on that D5, it is useful to have for setting alarms if the pump stops.

The answer for the heat question is, yes ... sort of. It is not actually the pump speed that makes the pump draw more power it is the flow rate. The higher the flow rate the more power draw and more heat transferred to the water, but the levels are relatively small. Even a full 24 watts at worst case is not that much. In most loops it is much lower.
Flow rate is directly related to pump speed but it is not the only factor, restriction also plays a part. The funny thing is that a pump at full speed will use more power in a low restriction loop than a high restriction loop simply because flow rate is higher. That is why its possible to burn out DDC type pumps in simple loops at full power, they overheat because flow rate is so high.
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post #9 of 47
Thread Starter 
Thank you REP+ givmedew and Jakusonfire.. Good info.

So flow rate, the lower the flow rate the higher the temps to the components. The higher the flow, the lower the component temps. Am I right? Well, if you don't include the restriction to the loop.

My loop right now will be just to the GPU --> Rez --> 240 Rad. A 2nd rad and a CPU block will come later. So my loop will look your setup Jakusonfire Eventuallly, I will have a vertical reservoir between the GPU and Bay. Then the pump will be under the reservoir. The rad will be under the pump.
Edited by WiLd FyeR - 5/31/13 at 6:01pm
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post #10 of 47
Quote:
Originally Posted by WiLd FyeR View Post

Thank you REP+ givmedew and Jakusonfire.. Good info.

So flow rate, the lower the flow rate the higher the temps to the components. The higher the flow, the lower the component temps. Am I right? Well, if you don't include the restriction to the loop.

My loop right now will be just to the GPU --> Rez --> 240 Rad. A 2nd rad and a CPU block will come later. So my loop will look your setup Jakusonfire[/B. Eventuallly, I will have a vertical reservoir between the GPU and Bay. Then the pump will be under the reservoir. The rad will be under the pump.

yes high flow should cool better to a certain point then it actually starts cooling less. because the water is flowing too fast to actually pick up any heat
Edited by seross69 - 5/31/13 at 6:04pm
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