It sometimes is a good idea to check on the components that are installed on your computer. This is extremely important in my opinion if someone else repaired it or if it is a brand new computer to see if all the components are still inside and did not get replaced by other cheaper ones.
PC Wizard is a fast software that displays those information in a clean interface. The overview lists the most important components such as CPU, Motherboard, RAM and Hard Drives. Every component has its own menu which displays additional information. The CPU tab for instance displays information about CPU frequency, temperature and cache.
I do use these information to search for firmware or bios updates for some of the devices installed, motherboard and DVD drive for instance. It is sometimes hard to remember those cryptic device numbers that the manufacturers seem to love so much. The fan and temperatures menu is pretty useful as well, I mainly use it to check the temperatures of my computer to make sure it does not overheat.
Four more tabs offer information about System Files, Resources and the Configuration of the computer. There are literally dozens of menus in each tab offering information about startup items, DirectX, Processes and Threads, the Boot.ini and Memory Resources.
It does offer an immense amount of information which can be useful for some advanced users. I however mainly use the Hardware tab to get information about installed hardware.
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I would recommend SIW, SIW has all the information about probably everything in your cpu.