Hi Bach0183, yes you should be able to run this in Eyefinity 3. Given the resolution of your LG monitors it’s not required to have a CAC-1170, our CAC-1153 Active HDMI adapter will work as well. If you want a more future proof adapter for possible upgrade to 4K UHD panels in the future your best choice is the CAC-1170. It’s expected to be back in stock at Amazon US early february. 

Link to the CAC-1153 on Amazon US: http://www.amazon.com/Club3D-DisplayPort-300mhz-Adapter-CAC-1153/dp/B00SOXO5B0/ref=sr_1_1?ie=UTF8&qid=1452852054&sr=8-1&keywords=cac-1153