If you are seeing Intel HD Graphics 4600 4 MB in your About This Mac, you might be running a Hackintosh and can fix it using the tips below.
As you can see in the video, you will need access to the EFI Folder. Once there, open the config.plist and add the changes. If you are a novice, using the Clover Configurator is highly recommended to make the edit after making a backup copy.