You don't need to be super accurate - it's best to allow a safety margin to accommodate things like power supply voltage variation and bearing lubricant viscosity changes as it is oxidised and contaminated over time. Try a few values until you find out what is the lowest % speed it will run at (keeping an eye on the temperature, and letting the fan run every so often). You can muck around with a temporary curve to find out what speed each fan needs to ensure that it is running (make the curve flat at your test minimum speed from 0 degrees C up to well above the current GPU temperature (or motherboard or case temperature for those fan control loops), so that you know the controller will be trying to run it at your test speed. For case fans, this is easier if it has a 3 or 4 pin lead with a yellow wire (as well as the red and the black), and it is plugged into a 3 or 4 pin fan header on the motherboard, because you should be able to get a fan speed reading with the right software. You can figure out what this minimum speed is by trying different speeds and observing the fan. If this occurs for long enough, the motor can overheat (the insulation breaks down and it will short circuit). Below this setting, the electricity that the fan controller is supplying is energising the fan motor windings and generating heat, but the fan is not turning, so there is practically no air flow over the motor to cool it. I have one case fan that will run at just over 20% speed and another that doesn't rotate until about 40%. That dashed line at about 22% speed on the image is MSI's guess at a general minimum speed, but it varies depending on the fan/motor design. Fans (or their motors) have a minimum voltage (corresponding to a minimum speed percentage) necessary to start them.
I wouldn't use that curve in the first image.
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