go to device manager it will tell you which gfx your using.
if theres a yellow [?] the driver has failed to install if its a red [!] then you may have other issues.
here is the thing i think it might be working but the only thing i can see on my display adapters is Intel hd graphics 4600, however i am quite sure i have a nvidia one, i even had the software from their site installed and i was customizing games ect ect ...