this is wrong. there are several people in the Catleap club who can confirm running HDMI at 2560X1440 as well as the specs for HDMI 1.3-1.4 prove it has the bandwidth needed to support this resolution.
2560X1440 ~220MHz HDMI 1.4 can do 340MHz
You can not use an HDMI to DVI cable due to it only being single link. You would need an active adapter (like the display port one) to convert the single link Input (such as HDMI/DP) into a dual link output.
They do not make these adapters for HDMI but you can run a straight HDMI to HDMI at 2560X1440...
Just don't want people to get the wrong idea about HDMI capabilities