Generation and cable choice are also important to consider. For example, an HDMI 1.4 connector is perfectly capable of running a 1080p external monitor but isn’t enough to deliver 4K at 120Hz.

HDMI 2.1: Supports up to 10K resolution at 120Hz, adds improved HDR with dynamic metadata and enhanced Audio Return Channel (eARC) to send Dolby Atmos and DTS:X audio from display to receiver.

The ability to mirror your iPad's display to an external monitor has been possible for years through an HDMI adapter (30-pin or Lightning). The new iPad Pro makes it easier to do -- arguably, as ...