2

Does anyone know this configuration 'over_voltage':

  • What does it do?
  • How can I configure it? (using config.txt and write the value?)
  • What are possible values?
  • What is the difference between it and 'over_voltage_avs'?

I found this configuration by chance when running

 vcgencmd get_config

I hope also if someone has good resource about other voltage/current configuration for raspberry.

For example, I found by chance also that voltage can be detected by running vcgencmd measure_volts <unit_name> with unit name as: core, sdram_c, sdram_i, sdram_p.

So does anyone know if we can measure volts of usb interface?

Thanks in Advance

  • Over-voltage is not related to USB, which is required by the spec to always be at 4.75V..5.25V. It's about voltage applied to different high-speed parts of the chip like CPU or video hardware. – Dmitry Grigoryev Nov 14 '16 at 10:52
3

The permitted over voltage values are given in https://www.raspberrypi.org/documentation/configuration/config-txt/README.md

CPU/GPU core voltage adjustment. [-16,8] equates to [0.8V,1.4V] with 0.025V steps; in other words, specifying -16 will give 0.8V as the GPU/core voltage, and specifying 8 will give 1.4V. The default value is 0 (1.2V). Values above 6 are only allowed when force_turbo or current_limit_override are specified; this sets the warranty bit.

To summarise

over_voltage=-16 # 0.8V
over_voltage=0   # 1.2V
over_voltage=8   # 1.4V

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.