Any idea how to overclock my 6680 with 256 MMC dual voltage ?????????
overclock 6680
Your post seems to be confusing a couple of things...
"Overclocking" means running the processor (CPU) on a computer with a clock rate higher than what is was designed to do. On PC's, if the processor tolerances allow, it will get you a faster machine without paying for a faster processor. On phones it can't be done.
Overclocking has nothing to do with memory cards (MMCs).
Your 6680 does require and supports the, so called, Dual Voltage (DV) RS-MMC type (Reduced Size - Multi Media Card) memory cards. It does not support the high-speed variants (as those need hardware that the phone doesn't have).