Question on reported processor speed in System Settings>details

view story

http://askubuntu.com – 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. It is now saying Intel® Core™2 Quad CPU Q9550 @ 2.83GHz × 4 My question is about how it determines the 2.83GHz, and could it be fooled by the manipulations of the BIOS? Edit: More info. The multiplier I referred to (and I probably used the wrong word) is the cpu clock ratio. Changing it (HowTos)