The HDMI port on the RTX 3090 is 2.1 (48gbps) and should be able to push resolutions higher than 4K, but it's no better than the DisplayPort. Both HDMI & Displa

The HDMI port on the RTX 3090 is 2.1 (48gbps) and should be able to push resolutions higher than 4K, but it's no better than the DisplayPort. Both HDMI & DisplayPort carry audio signals, but the Apple Studio Display only pipes audio over USB, so a single passive HDMI or DP cable will not transmit audio