Please note that it may be possible to set the configuration you are trying to get but it is necessary to have software that allows this configuration. Besides the software to handle the configuration, is necessary for board to support it.
I recommend you checking in the web for software that allows you to set this configuration.
Thanks Kevin for your response. I'm using Gigabyte Z87X-UD3H for my motherboard. I been searching online for quite some time but no luck. Is Intel providing any configuration tools on this? Thanks.
As soon as you connect the video card in the system, the graphics resources will be taken from the video card and the onboard graphics card will be automatically disabled.