The DLSS Frame Generation requires a GeForce RTX 40 Series graphics card and Hardware-Accelerated GPU Scheduling being enabled in operating system. In Windows 11 this option is turned on by default.
Enabling Hardware-Accelerated GPU Scheduling in Windows 10:
NOTE: it is recommended to enable upscaling (DLSS) on graphics cards with 16GB or less of VRAM and 1440p or higher resolution.