Hi Joseph09! Great question! HDMI 2.1 is a somewhat complicated specification, so to better help our customers with their TV decision-making, we highlight the specific features supported by each TV model.
All 4 HDMI ports on the Q70T are capable of Variable Refresh Rate (VRR), FreeSync, HDR10+, and Auto Low Latency Mode (ALLM/Auto Game Mode).
In addition, HDMI 4 supports 4K@120fps (FRL); HDMI 3 offers Enhanced Audio Return Channel (eARC).
If we can be of further help, please reach out to us at 1-800-SAMSUNG. ^Gina