I have a Gigabyte motherboard and cpu I inherited from my son when he bought a new gaming machine. I changed the BIOS from 8x to 6x multiplier as I don't need the speed and I'd rather it ran cooler and maybe more reliably. However, in system settings > details I don't think the reported speed changed.
Quad-core phones? Old news. All the manufacturers are doing that now. How about a 48-core CPU for smartphones and tablets? Intel’s looking to shake up the mobile market and make that kind of processing power a reality within the next ten years.