NvAPI_DRS_SetSetting have 3 or 5 args?

[xvde110]

i dynamic load API interface from nvapi64.dll，if NvAPI_DRS_SetSetting input 3 args, will return NVAPI_INVALID_ARGUMENT。
in nvidiaProfileInspector repo, DRS_SetSettingDelegate have 2 additional args， my program changed to 5 args and return OK。
i wonder why this happened。