Both the X900H and Z8H will eventually offer gaming-oriented HDMI 2.1 features, in addition to the usual game mode, but the level of support is inconsistent. The upcoming X900H firmware update will add support for 4K120 content, VRR, and ALLM to the TV, along with enhanced audio return channel, or eARC. The Z8H already supports 4K120 content and eARC, as well as 8K content at up to 60 Hz — but it doesn’t offer VRR or ALLM, arguably the two most important items on the list for gamers