Correct. Your processor has three DisplayPort output channels and each can support a monitor. One is being converted to HDMI, one is being converted to VGA and the third is being wasted as it is not routed anywhere in this design.
Your other option for connecting a HDMI monitor is by utilizing a USB 3.0 Display Adapter. Here's an example: Amazon.com: USB 3.0 to 1080p HDMI Adapter. This would be a low-performance option, however; not for monitors being used for gaming output.
Hope this helps,