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HDMI 1 is capable of 4K/144Hz and HDMI 2 is capable of 4K/120Hz. HDMI 4 features eARC support. Most customers prefer this as it allows them to connect 2 gaming consoles/ a PC to the advanced gaming ports and still have a port available to connect via eARC for advanced audio to their Dolby Atmos receiver or soundbar. Hope this helps! Thank you, TCL Customer Support
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