I am running two Apple Cinema Monitors I got used really cheap on eBay and one 144hz gaming monitor. When plugging in all 3 monitors at once Windows will not give an image on any of the monitors on startup, however the bios does load on my main display. Plugging in two monitors is just fine, windows will boot and give an image and everything works fine. Booting up with two monitors plugged in and once I reach the desktop plugging in the third monitor everything works just fine. With three monitors plugged in the PC wil not wake up from sleep, however again with two monitors plugged in it works just fine.