NvAPI_SetRefreshRateOverride() returns NVAPI_NO_IMPLEMENTATION

Platform: Windows 8.1 x64
GPU: NVIDIA GTX 770
Driver: 353.30

As the title states, I wrote a quick test program to see if this function worked. To my surprise, this function was not available on my driver? Is it meant for some other type of NVIDIA GPU? It seems so strange to me that this hasn’t been implemented!