Check the laptop label on the bottom or under the battery
Open System Information on Windows
Open Settings > System > About on Windows
Use Task Manager > Performance on Windows
Use Command Prompt and run `systeminfo`
Use PowerShell and run `Get-ComputerInfo`
Open About This Mac on macOS
Click the Apple menu > About This Mac
Use System Report on macOS
Check the manufacturer’s support page using the serial number
Look up the model number on the manufacturer’s website
Use BIOS or UEFI setup during startup
Check the original box or receipt
Use third-party tools like CPU-Z, Speccy, or HWiNFO
Check Device Manager on Windows
Check the laptop manual or product listing