This is a brilliant tool not only for clocking but also for identifing what is in the crap machine you've just been given that someone wants you to repair. 

Speaking of which anyone want a 10 year old Dell with 128MB RAM and win2000 that takes over 10 mins to boot? Very useful as a doorstop 

Been using this program for years and today I found out something about it that I didn't know it could do.

CPUz can tell you the speed of all the CPU cores at the same time, just right click on the core speed out-put box. Up to today I have been using a program called Speccy to do it 

In the attachment you can see that 3 of the cores are under clocked while core 1 is at maximum. The speed dose constantly change on all cores, that is what it was displaying when I did the screenshot. 

Indeed, nice to know.