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Pump speed - Page 2

post #11 of 15
Thread Starter 
Ah. How about for AIO CLC coolers, you pretty have no choice but to run it at full speed, right? I didn't know that there were PWM-controlled pumps until I read about it here.
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post #12 of 15
Quote:
Originally Posted by kevindd992002 View Post

Ah. How about for AIO CLC coolers, you pretty have no choice but to run it at full speed, right? I didn't know that there were PWM-controlled pumps until I read about it here.

Yes, you do have to run them at full speed, as far as I know. The only one I really have any experience with is the Thermaltake Water 2.0 performance.

The pumps in these are so small and low powered compared to a DDC or D5 that it isn't an issue.
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post #13 of 15
Thread Starter 
Quote:
Originally Posted by Capt Proton View Post

Yes, you do have to run them at full speed, as far as I know. The only one I really have any experience with is the Thermaltake Water 2.0 performance.

The pumps in these are so small and low powered compared to a DDC or D5 that it isn't an issue.

Got it, thanks!
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post #14 of 15
i just got a vari MCP655...

i saw this post and did a little experiment.

I started prime 95, ran it for 10 minutes with my pump turned all the way down to 1. then i ramped the dial all the way up to 5, which is about 4800rpms, and let it run for 10 minutes. i saw literally zero temp difference... ZERO. its just a lot louder....


and watch this video if you want more proof...


skip to 2:50


http://www.youtube.com/watch?v=scRV0d1zkys
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post #15 of 15
Quote:
Originally Posted by Electrocutor View Post

With a non-PWM pump, undervolting actually creates more heat because as you reduce voltage, amperage must increase since the resistance is constant. That's why the D5 has that variable control to change resistance, allowing 12v input to run the pump at lower speeds without needing more amperage.

In the case of a D5, most people run them at setting 3 or 4, but it depends on how restrictive your loop is. Your target flow rate is at or a little over 1 gpm.

A PWM pump, which is available in both D5 and DDC variants, allows you to dynamic control pump speed without wasted electricity.

http://www.joliettech.com/dc_drive_fundamentals.htm

amperage in a dc motor relates to the torque and has nothing to do with the speed....I’ve never seen anything but a centrifugal pump in a computer....and a closed loop isn’t going to have an increase or decrease in restriction...and even if it did the pumps resistance to flow (increased load) would happen when the flow increased....the resistance would decrease with less flow...since load on a dc motor impacts amperage then the slower the pump goes the less amperage....

and talking about the D5 a change in resistance to the pump is going to decrease the voltage.....

and if the heat dump from the pump bothers your system that bad you probably need bigger or more rads....
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