$ sudo nano /boot/config.txt

#fake_vsync_isr=1
#framebuffer_swap=0
#gpu_mem=48
#init_emmc_clock=100000000

#arm_freq=1150
#arm_freq=1085
#arm_freq=1050
#arm_freq=1095 for my other unit with heatsink

#over_voltage=2

#gpu_freq=530
#gpu_freq=520
#gpu_freq=300
#gpu_freq=550 for the unit with a heatsink

#core_freq=515

#sdram_freq=533
#over_voltage_sdram=1
#over_voltage_sdram_c=7
#over_voltage_sdram_i=7
#over_voltage_sdram_p=8

dtparam=sd_overclock=100
force_turbo=1