...is a tricky subject at the best of times, and even more so with an Intel (they've been good at locking down user changes like overclocking in the past).
It's highly likely, given the limited amount of detail you provide that CPU-IDz is working properly, and you are not overclocking. You may well be changing some BIOS entries, but they're having no effect (good ol' grandpa Intel!). It's also wise when you begin to gradually overclock that you run some CPU benchmarking tool (PC-Mark 2005 maybe?), which will show any speed improvement over stock speeds. If things do improve and CPU-ID still shows standard speeds, you'll know immediately which one is wrong.