On Windows, open Task Manager (Ctrl+Shift+Esc), go to the "Performance" tab, click "GPU," and look for "Dedicated video memory." On Mac, go to "About This Mac" > "System Report" > "Graphics/Displays."
To see VRAM on a Windows PC, go to Settings > System > Display > Advanced display settings, then click Display adapter properties. On macOS, go to Apple Menu > About This Mac, and check the Graphics section. It shows the GPU and available VRAM.