Why would a computer recognize an agp card as a pci card?

Answer 1

Because it most likely is. AGP, stands for Accelerated Graphics Processor (loosely) If you can put a modem in that slot it would most likely be PCI.

The card must be PCI. AGP and PCI cards are physically different. The connections to the motherboard are not identical or interchangeable. The PCI card is located more to the back of the case or board, while the AGP card slots are away from the edge and noticeably more towards the center of the motherboard.

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This is a common issue for AGP graphics cards if you are using an ATI chipset (for example: Radeon), or an ASUS chipset (for example: x800). Though I have not yet found the solution for this error, it does not seem to cause any major issues for Windows XP systems, so long as you maintain your Windows Updates.

It is also common for ATI / ASUS AGP graphics cards to report "echoes" - a PCI card that is "also installed" from your AGP socket. If this is the case, there may be issues with your motherboard or BIOS reporting incorrectly. Seek your computer manufacturer for technical assistance if this is the case.