Looking at getting a Cintiq Pro 24 tablet.... uses HDMI 2.0.... my CPU has 4 SS 3.0 USB ports and an HDMI port..... video card is NVIDIA GeForce GT 740M... Can anyone tell me if this Graphics Card supports HDMI 2.0?
Unfortunately it appears your machine would likely only support HDMI 1.4a which would only let the Wacom tablet operate at 4k 30Hz. Definitely not a refresh rate you want to be staring at for photo work.
Most displays will adjust to a lower than optimal resolution. Not sure about the pen functionality. I'd try it at 4K 30Hz first. The main drawback would be flicker which is often not an issue with solid state displays because they scale to 60Hz internally.