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Lenovo Thinkpad Thunderbolt4 Dock does support HDMI 2.1 output with 4k@120hz G-Sync to LG CX w/ Legion 7i RTX 3070 : r/UsbCHardware
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Lenovo Thunderbolt 4 Workstation Dock Split Cable for Thunderbolt 40B00300US P/N 4X91K16970 0.7m Length. : Amazon.ca: Electronics
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