The
Hitachi SH7750 includes a number of integrated
peripherals, but it doesn't have any sort of on-board
graphics engine.
The 128-bit graphics processor used in the Dreamcast is actually an
NEC PowerVR "VR2" chip.
PowerVR cards used to be available for the PC and were actually quite popular for a short while, but the
3DFX "Voodoo" card was generally considered the better solution and rapidly pushed the NEC chipset into relative obscurity.