But immediatly after passing that 73☌ mark, the fans do not react to any tool/software anymore until temperatures drop again. If I set it to 20%, the fans spin up to 20%. If I set the fan speed to 0, the fans stop spinning. Below this temperature, the fans perfectly react to my settings, regardless of the tool.

I can not get it to stop going to 100% speed if the 73☌ are reached. However, using various different tools like Fan Control, MSI Afterburner. I tried to adjust the fan speeds to set up a more reasonable curve, where the fans would not spin at all until a certain tempreature is reached and then then evenly increase the speed as the temperatures get highter. Take note that MSI Afterburner is only a fan control software for the GPU and does not provide any control for CPU fan speeds. It also shows that pressing Fn+F5 cycles the laptop through different power management modes. The owners manual for the MSI G60 states that some models of this laptop have a 'cooler boost' button that controls the fan speed. It can be very annoying because the fans are extremly loud at full speed. If any fan control is possible it will be via the BIOS. This appears to be MSIs Cooler Boost 'feature'. Whenever the cards temperature goes above 73☌, the two fans will start to spin at 100% until the temperature drops down below that 73☌ point. U cant control the CPU/GPU Fan simple as that, it has a hardcoded firmware based preset within the BIOS that controls the fan speed curve, based on temps.

Msi laptop control fan speed