I don't ever want to have a PCI graphics card again for any reason, except possibly the very first GPUs as some kind of historical piece. Like collecting old PC's like Commodore 64, Amiga, Atari ST, etc.
That guy sounds like he has a dedicated graphics card slot, Everest can tell you. 3DMark06,05,03 can tell you too. There are several other ways. It may be printed in small type font on the mobo itself.
You can game with PCI graphics cards, but you can't seriously play anything released in the past few years that uses polygons. Unless you are cool with an ultra choppy slideshow, which I have played games at 0-2 FPS throughout with onboard. XD