I've just installed Kali Linux on my SD card that I use with Raspberry. This new OS I think is very good, but at the installation I don't have the opportunity to overclock as it is possible with Raspbian so I'd like to try to check differences. How could I do?
While the post above me shows you how to install raspi-config, it won't actually get the config.txt file working. Simply making /boot/config.txt puts the file in the wrong place for the Kali install. I followed the instructions here: http://rageweb.info/2013/11/07/bootconfig-txt-in-kali/ and it worked for me. The problem is that /boot/ isn't actually the boot partition, so you are placing the file in the wrong place (even though it seems right).
While you may not be able to install raspi-config, you should still be able to create the file
config.txt is in
/boot/, add any required parameters.
In your case, check out some of the overclocking options in the eLinux wiki. As always is the case with overclocking, be careful!