Hi, so i bought an HP Envy 15" Touchsmart about a year ago and i noticed that it has an NVIDIA GPU inside. However, i checked my system and its using an Intel HD 4600 GPU! i looked everywhere for any signs of an NVIDIA GPU/file/driver/product in my PC but nothing was found...Am i missing something? Can i switch the GPUs like everyone is saying, or did i get lied to by HP. Thanks!