How to Identify a Windows on ARM PC

Most Windows PCs use Intel or AMD x86 processors, while some run on ARM-based chips. Since each architecture has its pros and cons, it’s useful to know which one your system uses.

Note: ARM PCs aren’t the same as Copilot+ PCs. While the first Copilot+ devices used ARM-based Snapdragon processors, newer models also feature Intel and AMD x86 chips.
This means some Copilot+ PCs are ARM, but not all ARM PCs are Copilot+.

Check the Specs and Stickers
To check if a PC runs ARM hardware with Windows 11 on ARM, look for the processor brand in the specs. Qualcomm’s ARM-based chips use the Snapdragon name—for example, the Lenovo Yoga Slim 7x with a Snapdragon X Elite processor. In the future, MediaTek chips will also indicate ARM-based Windows PCs.

Check the Settings
You can check the Settings app in Windows to check if a PC has an ARM processor or not. Press the Windows key and X key at the same time, then select ‘System’ in the popup menu. You can also search for the Settings app, then navigate to System > About

The About page lists some of the computer’s specifications. If you see “ARM-based processor” under “System type,” then you have an ARM Windows PC. Other PCs usually say
“x64-based processor.”

Check the Terminal or PowerShell
You can also use the Windows Terminal or PowerShell to check the current CPU architecture. First, open the Start menu, search for Terminal or “Windows PowerShell” (it doesn’t matter which one), and open it. And Type “$env:PROCESSOR_ARCHITECTURE” , then press Enter/Return:
This will return “ARM64” if the current PC is using ARM hardware, or possibly “ARM” if the PC has an older 32-bit ARM processor. Other types of computers will display values like “x64” (for 64-bit x86), “x86” (for 32-bit x86), or other values.

Credit : https://www.howtogeek.com/how-to-identify-a-windows-on-arm-pc/