Press Windows + R, type msinfo32, and check 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,Version,SerialNumber
Check the motherboard model printed on the board itself
Open the PC case and look near the CPU socket, RAM slots, or PCIe slots for the model name
Check the motherboard box, manual, or purchase receipt
Use a system information tool such as CPU-Z, Speccy, or HWiNFO
In BIOS or UEFI, look for motherboard or system information
On a Mac, check About This Mac and System Report for the model identifier
On Linux, run: sudo dmidecode -t baseboard
On Linux, run: sudo lshw -class motherboard