Open System Information on Windows by pressing Win + R, typing msinfo32, and checking BaseBoard Manufacturer, BaseBoard Product, and BaseBoard Version
Open Command Prompt and run wmic baseboard get product,Manufacturer,version,serialnumber
Open PowerShell and run Get-CimInstance Win32_BaseBoard | Format-List Product,Manufacturer,SerialNumber,Version
Check the motherboard model printed directly on the board inside the computer case
Check the motherboard box, manual, or purchase receipt
Use third-party system tools such as CPU-Z, Speccy, or HWiNFO
On macOS, check the model information in About This Mac for the Mac model, then look up the logic board details for that model
On Linux, run sudo dmidecode -t baseboard
On Linux, check /sys/devices/virtual/dmi/id/board_vendor and /sys/devices/virtual/dmi/id/board_name
Check the BIOS or UEFI setup screen for motherboard information