active or using GPU in Lenovo G50-80 I7 (with graphics card radeon)

Dear All

 

How to activate,setting or  using GPU in Lenovo G50-80 I7 where through the technical Spec the video driver are AMD Radeon R5 M330 / Intel HD Graphics 5500 - 1 GB (Support for GPU) and the program driver i use to install is radeon

 

Lenovo G50-80 Laptop Specs - CNET

 

Thx