The AGP port looks similar to the PCI slots - but there are differences. It is often a different colour (brown, or green as opposed to PCI's normal white colour), it is always located up the top end of the PCI slots (nearest to the processor) and is set back further from the edge of the board than the PCI slots. It also has a clip/lock to lock in your graphics card to stop it moving - this is down the far end of the slot (away from the edge of the board). You can buy PCI graphics cards but they are different from AGP cards - they will not work in the other slot (at all).
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