Welcome to the first mainstream video capture device that supports HDMI 2.1, albeit only in passthrough and without 8K capture. The point is that you can hook this thing up in between your PC and a monitor without losing HDMI 2.1
output to the latter. Anyway, in capture terms, 4K is plenty. Hardly anyone has the means to playback 8K. The box itself is nicely made, and the HDMI 2.1 support means you can capture gaming content at high frame rates, including 4K@144Hz.