So I know what a 'K' series CPU is. They have an unlocked multiplier, so they're the only way to go when you want a serious overclock.
My question is, how do they lock the multiplier on other CPU's? I'm not a cpu architecture guru, but isn't the multiplier controlled by the mobo, not the cpu? All the CPU's are cut from the same die, so how do some of them not allow multiplier changing?