VIEWSONIC VX3276-mhd 31.5" 16:9 IPS Monitor - Manual (Page 15)

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3.A. Please do not connect the DisplayPort out on the monitor
to the DisplayPort or mini DP connector on the computer.
DisplayPort out is used for daisy chain connection (Explained
in section C)
3.B. Video and Audio Cable
For a MAC with Thunderbolt output, please connect the
mini DP end of the “mini DP to DisplayPort cable” to the
Thunderbolt output of MAC. And connect the other end of the
cable to the DisplayPort connector on the rear of the monitor.
*This picture is for reference only