Welcome to the forum Dogukan,
I understand your confusion about the switchable graphics, websites such as “Can You Run It” will not recognize your graphics card because its not in use. The 7670m I believe uses the same Enduro technology as my 7970m. What I recommend is looking up your graphics card desktop equivalent so you can compare game requirements without the aid of “Can You Run It”. Your card is about 4% better than a Radeon HD 5570, so use that as reference. When it comes to drivers don’t worry about updating the Intel HD 4000 just update your AMD 7670m.