Just bought the Samsung UN65KS8000 TV. I game on PC with a GTX 970. I can get 3840x2160. Problem is it sits at 30hz when I connect PC to reveiver and receiver to TV. It's a Yamaha RX-V573. When I take that same cable and connect directly from pc to tv, it keeps the resolution and goes to 60hz like I want. Is the only option to get an optical cable to get audio through receiver? Also, the output cable for receiver is same as other hdmi cable. Both 2.0.