Check the device label or model number on the graphics card itself
Open Device Manager on Windows and look under Display adapters
Use System Information and check Display
Run DirectX Diagnostic Tool and check the Display tab
Open Task Manager and view GPU under Performance
Use a system info tool such as CPU-Z, GPU-Z, or Speccy
Check your computer or laptop specifications from the manufacturer
Look at the original purchase receipt or product listing
Open the case and read the sticker on the card
Check BIOS or UEFI hardware information if available