GP4 graphics problem with new laptop

hi evrybody

I've a new laptop (Hp Envy) It's a full-hd screen with 15'6 inches and 1920*1020 res, processor is an i5 and the graphic card a NVidia GTX 850M

I've installed GP4 and i've set the f1graphics file to put the higer res. I've tested a lower res, 1440*900. But each time, when i play the game, graphics are not really good. Furthermore, in graphics menu, the game detect the HD Intel graphics card but not the GTX850M. it's Strange because in the NVIDIA Config, i've associated Gp4 to the GTX...