That depends on what kind of displays you want to run.
What are your two displays?
Nothing special ... two Acer AL1916
thanks for responding...
If you want to run both monitors with DVI-D connections, then you should add a video card that supports dual DVI-D connections. If your monitors have connection options, then you may be able to connect to a couple of the ports on the board. The Intel product technical specification, available on the DZ68BC support page, will specify the limitations. I'm not familiar with your monitors, but I did a quick check of the specifications and the specs indicated that there are variations depending on model number. So, I'm not completely sure of your monitors' capabilities.