Raspberry Pi Lab

Overclocking the RPi

by on Apr.13, 2014, under Installation

The RPi runs at a default speed of 700 mhz.  I don’t know about you, but that is a bit slow for my tastes.  While I understand that overclocking does generate additional heat and does reduce the life of the device, I am willing to take that risk to get a lttle more speed out of my RPi.  After all at a price of $35 USD, I can afford to replace one occasionally.

The overclocking can be done from the ‘sudo raspi-config’ utility.  However, the real settings are in the file “/boot/config.txt”.

Just for those who aren’t aware… the RPi does NOT have a BIOS.  Therefore the base paramaters that would normally be loaded from a BIOS are moved to the filesystem of the SD card on “/dev/mmcblk0p1”.  This file system is mounted in the OS as “/boot”.

First, make a copy of your “/boot/config.txt” file with “sudo cp /boot/config.txt config.txt.original”.  It’s always good practive to back-up a file before monkeying around with it.

I tried pushing my RPi to the 1 ghz max clocck speed, but it did not work.  The system immediately crashed.  So I resored my config.txt file, re-booted and tried again.  This time I configured it for 950mhz.  This setting has been working for about 48 hours without issue.

Here is the relevant portion of my /boot/config.txt file…

#uncomment to overclock the arm. 700 MHz is the default.
arm_freq=950

# for more options see http://elinux.org/RPi_config.txt
core_freq=250
sdram_freq=450
over_voltage=6

 

 

 

 

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