High Sierra 13.13.3 Partial Working

Hello, I have this hardware: - I5 4570s - ASRock H81M-VG4 - EVGA GTX 970

I have two problems: 1 - I cant make sound work with my setup (Realtek ALC662 Audio Codec) 2 - Everytime i restart my pc i have write to use nvda_drv=1, how can I get it to initialize with this automatically?

Anyone can help me?

Thanks.