https://github.com/recalbox/recalbox-os/issues/896 resumed and translated from french : after tests on 20 different Pi3, configurations are : arm_freq=1400 (Extrem) / 1350 (High) / 1300 (Normal) over_voltage=4 sdram_freq=575 sdram_schmoo=0x02000020 over_voltage_sdram_p=6 over_voltage_sdram_i=4 over_voltage_sdram_c=4 core_freq=500 v3d_freq=500 h264_freq=333 gpu_mem=256
