Yes, it can support 3 monitors (both mobo and CPU). Even 4k. However, the mobo has 1 DVI, 1 HDMI and 1 DP, so if you plan using 3 monitors, you have also to plan which monitor gets which connection.
"Onboard Graphics
• 1 x DVI-D port, supporting a maximum resolution of 1920x1200@60Hz
• 1 x DisplayPort, supports a maximum resolution of 4096x2304@24Hz, 2560x1600@60Hz, 3840x2160@60Hz,1920x1200@60Hz
• 1 x HDMI™ port, supports a maximum resolution of 4096x2160@30Hz(7th CPU), 4096x2160@24Hz(6th CPU), 2560x1600@60Hz"