Recipe to overclock Pi4

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+\r
+## Overclock\r
+\r
+Watch your speed with one of these commands:\r
+```bash\r
+cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq\r
+vcgencmd measure_clock arm\r
+watch -n 1 vcgencmd measure_clock arm\r
+```\r
+\r
+To edit the overclock setting:\r
+```bash\r
+sudo vi /boot/config.txt\r
+```\r
+\r
+```ini\r
+# uncomment to overclock the arm. 700 MHz is the default.\r
+over_voltage=6\r
+arm_freq=2000\r
+```\r
+\r
+[Explanation of availabe settings](https://haydenjames.io/raspberry-pi-3-overclock/)
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