Piriform - (Free)
Speccy is a system utility that helps to know the computer and its hardware configuration and whether or not to update the hardware configuration.
Speccy is an efficient system utility used for computer diagnosis. It displays in an easy and friendly interface, all information about the hardware configuration. This information is grouped into seven main categories: operating, CPU, RAM, motherboard, graphics card, hard drives / SMART monitoring, optical discs and audio system.
Speccy also shows the temperature of the various components - each core processor , graphics card and hard disks - and offers to save screen captures to facilitate the use of information.