Warning: Almost always CPU time limit in BOINC and TThrottle are inferior in terms of temperature vs performance. This tool work by constantly stopping and starting the tasks which wastes a lot of computational resources (that still produce heat).
To manage GPU hating, use the driver control panel or Afterburner to decrease the power target.
To manage CPU heating, use Windows Power Profiles cpu power stat limit. This will automatically and safely underclock and undervolt your cpu to save heat. I often set mine to 80%.
Granted this is not set and forget, but you can make multiple power profiles and switch them from taskbar. With radeon drivers you can probably tie your power target to windows power profile.