Thanks for the reply! When I turn the pump to full speed in either PWM or DC mode, I can hear the bubbling/flowing noise quite audibly. In most cases, CPU fan(s) is/are required to run at least on minimum rpm or computer wouldn't even BOOT. Only radiator fan(s) should be adjusted automatically according to CPU temps and case fans according to temps inside the case mostly measured at chipset and VRM.
This: "Lastly, is it recommended that I leave my pump off till the CPU hits a certain temperature" is completely false and quite opposite, pump on those coolers should be made to run full speed all the time.
motor has less power so it has to turn slower because of air resistance.įor longevity it doesn't matter at all but with PWM you can have finer speed control, that's all. PWM (Pulse Width Modulation) is way where speed is adjusted by varying frequency and with of electrical pulses into a motor.ĭC (Direct Current) motor speed is adjusted by changing voltage available to it (typically 9 to 12VDC). Lastly, is it recommended that I leave my pump off till the CPU hits a certain temperature? My GPU (stock air cooled) is turned off till the core hits 40c. (From my mobo, the minimum fan speed for PWM is 20% and the minimum for DC is 60%)įrom OpenHardwareMonitor, it says Fans 4, 5 and 6 (I assume those are the 3 case fans) are running at 100%. When I switch from DC to PWM, the LED also becomes significantly brighter and the fans sound like they are running at full speed, despite being able to set a lower fan curve than I am with DC, they still run louder. I also have 3 chasis fans (all connected to Chasis 2 slot):Ģx Corsair SP120 PWM (1 with LED and 1 without)ġx NZXT stock fan that comes with the NZXT S340 case However, when it's on DC, the pump is silent. In the bios, (my pump is plugged into Chasis 1 slot) when I swap from DC to PWM, the LED gets significantly brighter and the liquid starts making a flowing/bubbling noise.
I have an ASUS H97 Plus mobo, cooled with the Cooler Master Masterliquid 120.Īs far as I understand, PWM is superior for longevity and if you have 4 pins, you should be using PWM.
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