Hi all,

I am a newbie for computer. Recently I get ACER V3-571G with 2 graphic cards: Nvidia GT640M with 2Gb RAM and an Intel HD Graphics 4000. When I first time boot the system, the "Graphics" tab of the log was displayed the better card (Nvidia) with a score of 5.9, However, when I boot today, the graphic card was changed to Intel HD Graphics and the score is lower (5.8). How can I change to Nvidia gard?