This can refer to the internal graphics engine, or the path from the controller to graphics memory.

A "true 128-bit" graphics subsystem contains incorporates both a 128-bit internal graphics engine in addition to a 128-bit path from the controller to graphics memory. Graphics boards based on this technology provide enhanced 2D and 3D performance in comparison to the older 64-bit technology. The NVidia TnT would be an example of a true 128-bit chip, while the S3 Savage 3D would be an example of an internal only 128 bit chip.