TechPowerUp published a review on the AVerMedia Live Gamer Ultra 2.1 Capture Card
A quote from the article:
Content creators had to be patient to get their hands on an HDMI 2.1 capture card, but the AVerMedia Live Gamer Ultra 2.1 made the wait worthwhile. With its impressive video capture and passthrough capabilities, it stands out as the best capture card launched in recent times.AVerMedia Live Gamer Ultra 2.1 Capture Card Review