/proc/acpi/termal_zone/THRM0/trip_points where THRM0 indicates your thermal zone and might have a different value on your pc.
you also should set the polling frequency to something like 2 seconds (the file is named polling_frequency and is situated in the same thermal directory as the file trip_points and it is writable while the file trip_points isn't writable).
the last thing that you could adjust if the processor throttling. the file to see your processor throttling capabilities is: /proc/acpi/processor/CPU0/throttling
the file /proc/acpi/processor/CPU0/limit indicates the processor limits including active limits.
be aware that the throttling sets your processor to idle states in which it doesn't responds. the percentage 00% indicates no idle while 90% indicates that it stays idle for 90% of the time the pc is open. the throttling is good for having power saving but it's not indicated at more than 20% on a everyday desktop system.