I wonder how can i reduce my cpu or gpu mining so its not under 100% load all the time, for example, i want to run it both up to 90%.
This is certainly possible and should work in all mining software. The exact command will depend on which miner you’re running. When I was doing GPU mining with cgminer, the command to enter was “intensity –x” where x was a number from 1 to 9.
I suggest you consult the documentation for whichever mining software you’re running to get a more exact answer.