That HDMI in feature sounds awesome, but how exactly would that work? What I gather from the article is that you plug your device, say an xbox, into the HDMI in port and you can toggle the display on your monitor between the computer and the device (xbox etc.). But does this require using the onboard GPU? And does it limit sound out to the onboard HDMI port? (just for my defense, I only want to play guitar hero using it, at 1080p none the less).