On my Corsair iCUE 220T RGB ATX case this small and efficient tool displays max CPU usage on the top fan, max disk %time usage on the middle fan (green for reads, red for writes), and max network activity on the lower fan (red for bytes sent, green for received).
Advantages over Corsair’s own tooling:
It currently only supports Corsair Lighting Node Core attached to 3 RGB FANs with 8 RGB LEDs each (which is the pre-installed setup that comes with a Corsair iCUE 220T RGB ATX case). If you need support for other configurations, feel free to comment and donate.
Here you can watch it in action (Windows backup is currently running):