Function nvapi_hi::sys::gpu::NvAPI_GPU_GetPhysicalFrameBufferSize

pub unsafe fn NvAPI_GPU_GetPhysicalFrameBufferSize(
    hPhysicalGPU: NvPhysicalGpuHandle, 
    pSize: *mut u32
) -> i32

This function returns the physical size of framebuffer in KB. This does NOT include any system RAM that may be dedicated for use by the GPU.