Programster's Blog

Tutorials focusing on Linux, programming, and open source

Check If CPU is Being Throttled

If you want to see if your cooling solution is enough for your CPU to work at 100%, you can check it's current frequency by running:

sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq

You can compare this number (which is a Khz integer) against the maximum possible frequency of your CPU (which is also in Khz):

sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq

Please bear in mind that the "max frequency" listed for Intel is actually the max turbo frequency.

Testing With My Hardware

I was rather surprised that my Arctic Freezer 7 Pro Rev2, which cost me £10 when I bought it a while back, is able to keep my Intel i5 4670k boosted to just over 3.6ghz whilst all 4 cores were running at 100% converting a video with ffmpeg. For reference, the base frequency on that is 3.4 Ghz and the max turbo frequency is 3.8 Ghz.