CPU PLL Overvoltage is in the Advanced CPU Core features page. On the advanced frequency settings page, right under the CPU clock ratio = click to enter.
Keep in mind if you are overclocking you will be limited to whatever CPU multiplier your CPU can do without CPU PLL Overvoltage enabled, this is likely less than x47/x48 or so. Otherwise if you try to use too high of a CPU multiplier you will still run into booting issues due to the CPU multi being too high without CPU PLL Overvoltage enabled.
Since those are budget boards, you may not have this option anyway, so it would be disabled. I'll check your BIOSes right now.
*Edit*
Just checked both of those boards latest BIOSes, the option is not present, so it would be disabled by default.