Though Windows 7 comes with control panel items which can give you information about your system hardware Speccy has an edge over it by providing in depth details of hardware configurations without making it messy. This freeware allows you to in depth details of your OS, Graphics Card, hard Drives etc with details which can be compared to what you can see in your BIOS. Very Handy for system admins or users who understand hardware to that level.
There are two versions of which one is portable setup which you can carry in your usb drive. This gives you an advantage of checking multiple computers. Download from here