Lshw is a nifty small command line utility that generates detailed reports about various hardware components on the system. It does so by reading different files in the /proc directory.
Lshw is capable of reporting memory configuration, firmware version, mainboard configuration, CPU version and speed, cache configuration, bus speed etc.
Lshw also comes with a gui frontend called lshw-gtk that reports the same information in a minimal graphical user interface. Here is a screenshot.
NOTE: Some Linux distributions may already have a tool similar to this, that is installed during the initial installation of the operating system.
Full article here:
Get hardware information on Linux with lshw command (BinaryTides)
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2 GUI tools to check hardware information in Linux (Linux and Life)