On Windows, press Ctrl + Shift + Esc, open Task Manager, and check the Performance tab under GPU
On Windows, press Win + R, type dxdiag, and check the Display tab
On Windows, open Device Manager and expand Display adapters
On Windows, open Settings, go to System, then Display, then Advanced display, and check the display adapter info
On Windows, use the System Information tool and look under Components, then Display
On macOS, click the Apple menu, select About This Mac, and check Graphics
On Linux, open a terminal and run lspci | grep -i vga
On Linux, open a terminal and run glxinfo | grep “OpenGL renderer”
On Linux, use inxi -G if installed
Check the graphics card label on the physical card if you can open the computer case
Check the original purchase receipt, product page, or system specifications
Use a hardware info tool such as GPU-Z, Speccy, or HWiNFO on Windows