Learning with Raspberry PI, Delivery IV - Overclock and Overvolt of IP

In previous deliveries We saw as dump OS Raspbian, based on Debian on an SD card, as update the Software and the Firmware of our Raspberry, and How to make or overturn a complete picture of the SD card making the main memory in the PI function.

This time we will see how to apply Overvoltage and Overclocking our small Raspberry PI without losing the warranty, by considerably increasing its power, but not too shorten your life, and we will do this by choosing one of the configurations of the table of values RPI-config (the following graphic menu) us offers.

Screenshot of 2014-07-19 18:09:49

Overclocks predefined by the RPI Foundation.


For this type “sudo rpi-config” a terminal either from a keyboard connected to the pi, or from a remote terminal using SSH or some Remote Access Protocol similar, and choose the seventh option that refers to the Overclock.

Screenshot of 2014-07-19 18:09:26

Rpi-config menu.

The values that I have chosen they increase a 40% about the final power of the Raspberry, i.e. that if initially the ARM11 processor works to 700MHz could go up to 1 GHz, but we will leave it in 950MHz to keep it stable, Since it is possible that if you squeeze the most the hardware consider unwanted reboots when we reach high peaks, In addition we also alargaremos the life of the device as we suggest to apply the changes.

Screenshot of 2014-07-19 18:09:42

Warning message.

It is possible to make these changes manually, and in a way that is as valid as the previous, and in my opinion more simple, by changing the following parameters to the end the config.txt file, that is in the following absolute path:

/boot/config.txt

#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

Then we can see how the indicator changes to verify that the modification has been applied, Comparing the before and after.

Screenshot of 2014-07-19 18:08:57

We have not yet implemented the Overclock/Overvolt.

Once we apply the overclock and the overvolt We can see how the “scaling governor” change the mode Powersave by the way OnDemand.

Screenshot of 2014-07-19 18:11:12

Overclock/Overvolt already applied.

Mode OnDemand as we will see below allows that the CPU down to rest its 700 MHz and 1, 20V original When there is load no, and go up the frequency and the voltage we have specified in the configuration as needed, to conserve even more the life of our PI.

Screenshot of 2014-07-19 18:12:02

Raspberry PI giving it everything to 950 MHz and 1, 35V.

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