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
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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.