Yes, the two ports do output video at the same time when the output is set to 4:2:2 (8-bit or 10-bit) mode. When the output is set to 4:4:4 mode, only the HDMI is active. This is due to a limitation of 3G-SDI to transmit 4:4:4 video at 59.94 or 60 FPS.
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