Check the device manager on Windows
Open Display adapters
Read the graphics card name listed there
Use Task Manager and open the Performance tab
Select GPU to see the graphics card model
Open System Information and check Components then Display
Run DirectX Diagnostic Tool and check the Display tab
Check the graphics card label on the physical card
Look at the computer or laptop specifications page
Use terminal commands like lspci on Linux
Use About This Mac or System Report on macOS
Check the packaging or invoice if available