Water-cooled CPU and air-cooled GPU

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PID Usage and Example

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The default configuration works well on a PC with a water-cooled CPU and an air-cooled GPU:

• Uses a supply water temperature sensor and a case temperature sensor

• Controls supply water temperature to 2-3°C above case temperature (initial setpoint is 28°C)

• Fan output percent is generally between 45%-60%, unless CPU is loaded

• If case temperature is within 2°C of supply water temperature, and fan output percent is greater than 60% for 20 seconds, the setpoint increases by 0.25°C

For example, the fans are controlled to keep supply water temperature at setpoint:

Example 1.1

In the same dataset as Example 1.1, and only plotting fan RPMs and DeltaT (return temp - supply temp), observe the fan speeds trailing DeltaT (which represents CPU load in the following example):

Example 1.2

Next, an air-cooled GPU is used for about 30 minutes, showing setpoint adjustment keeping fan speeds within the configured range:

Example 2

The same behavior is observed, except caused by room temperature changes, in this example:

Example 3

When only the CPU is loaded, the setpoint temperature does not change, and the fans speed up as needed:

Example 4