There are no Windows or DOS commands that
can positively identify the CPU in your computer.
The Windows 'System.Properties' dialog (available by right-clicking the
'My Computer' desktop icon) may provide some rudimentary information about
your processor. But for real detail, you need software.
A good utility for this purpose is WCPUID,
available free from
WCPUID provides details such as clock speed, cache sizes, and numerous
other CPU characteristics.
For more good CPU software, check out UGeek's
CPU software page.