Overclocking Undervolting System Tweaks Tool for Sony Erricson Xperia Neo Arc. Now modified work with NEO Arc Play X10 X8 LG Optimus Speed Samsung Galaxy and maybe others. Set voltages on. /proc/overclock/ mpu_opps. /sys/devices/system/cpu/cpu0/cpufreq/ vdd_levels. Some functions only work if Kernel support it!