Raspberry Pi Overclocking
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Raspberry Pi Overclocking Guide
Is your Raspberry Pi just a little bit on the sluggish side? You wished those menu would be a little more fluid? Then it might be time to consider overclocking your Raspberry Pi. Essentially you are attempting to make the processor or ram run a little bit quicker than originally designed.
Raspberry Pi overclocking will vary from Pi to Pi. Depending on how lucky you get, you may get a 50% increase in clock speed or a 0% increase in clock speed. Remember, overclocking is an art! Some people want a quick overclock and bump their arm_freq, core_freq, and gpu_freq a nominal amount. Others will tweak and tweak to squeeze everything they can get out of their Pi. A failed overclock, reaching the upper limits, will cause system instability or an inability to boot.
NOTE: Overclocking your Raspberry Pi will NOT void your warranty. Overvolting your Raspberry Pi WILL void your warranty.
Most Raspberry Pis can will reach an arm_freq between 800-900, a gpu_freq between 300-350, and a sdram_freq between 450-550 without any overvolting. I think core_freq is between 300-400 without overvolting, as the XBian config defaults it to 375MHz.
There are a few clock values that you can adjust for your Raspberry Pi:
- arm_freq – Sets the frequency of ARM processor. The default value is 700. (MHz)
- gpu_freq – Simultaneously sets the frequency for: core_freq, h264_freq, isp_freq, and v3d_freq. (MHz)
- core_freq – Sets the frequency of GPU processor. This will have an impact on ARM performance. The default value is 250. (MHz)
- h264_freq – Sets the frequency of hardware video block. The default value is 250. (MHz)
- isp_freq – Sets the frequency of image sensor pipeline block. The default value is 250.(MHz)
- v3d_freq – Sets the frequency of 3D block. The default value is 250. (MHz)
- sdram_freq – Sets the frequency of of SDRAM. The default value is 400. (MHz)
NOTE: You can check your arm_freq by executing the following command in terminal:
NOTE: gpu_freq controls three values simultaneously. If you wish to control these values independent of one another, you’ll need to disable gpu_freq and enable h264_freq, isp_freq, and v3d_freq.
NOTE: There are two ways to deactivate a clock parameter, you can either completely delete the value from your config.txt or place a “#” in front of the parameter you wish to disable. Placing a “#” indicates that the corresponding line of code is a comment and will not be executed.