What is USB-C power?

In plain language

A supply rated 5V 2A can deliver up to two amps. A standard single USB port is specified at 5V 0.5A — a quarter of that. The connector is identical either way.

Why it matters in your setup

Underpowering an HDMI device produces confusing symptoms rather than an obvious failure: it works at low bandwidth and drops out at high, or the display flickers only during demanding scenes. It reads like a cable fault.

There is a useful nuance. USB ports are often implemented behind a four-port hub chipset that shares its budget across all four. Use only one of the four and you can frequently draw up to 2A from it, which is why powering a device from a TV or computer sometimes works perfectly and sometimes not at all.

What the DR HDMI 8K does with it

The DR HDMI 8K ships with a 5V 2A supply and that is what the manual recommends. In practice it needs roughly 5V 1.5A to operate at full capability, so a single shared USB port is not enough while one port of a four-port hub often is. If a chain fails only at the highest bandwidth, power is worth ruling out before the cable.