Hi

Can anybody help me to reach 120hz on alienware alpha HDMI? I have read that with 1.4hdmi it is possible and it supports 1920×1080 resolution at 120 Hz. But i cant find how to get it. I have in control panel maked custom resolution with 120hz but without success -> it shows "input not supported" on the black screen

My monitor is Acer GN246HLBbid 144hz

Thanks everybody for answer...