

This website seems to indicate that you can either do it in the bios directly, or with traditional overclocking softwares like MSI’s Afterburner.
Though you specified you don’t want to take it apart, i’d recommand changing your thermal paste anyway to avoid damaging your cpu. Maybe you can bring your pc somewhere else if the place where it’s at is the problem. But anyway, that’s none of my business.
Consistent through the year, sparing on both pyjamas and laundry, 17 to 20 are the way to go