U2717D, HDMI, 1080 maximum resolution

I just purchased a U2717D with a max resolution of 2560x1440 (QHD).  My video card is older, but has HDMI output and can support this resolution per published specifications. When I connect my CPU to the U2717D via HDMI, 1080P is the highest resolution that is available in Display Settings. I ordered a new HDMI high speed cable. What is the most likely culprit? Is there a limitation set to the HDMI input resolution on the monitor? Can I specify a custom display resolution setting and expect that to work over HDMI?

-Jim B.