I just bought a 4K Ultra HD (3840 x 2160) TV, with 120Hz refresh rate. I have an HD cable box from Xfinity. They're telling me it isn't 4K, but I can exchange it for a 4K box.
I ordered two HDMI cables:
1. Supports 4K video at 24 Hz, 1080p at 60 Hz, 48-bit color, bandwidth 10.2 Gbps.
2...