What is the diff between AGP & PCI Express card?

The two are different types of slots for video adapters with PCI Express being the newer and better performing interface.

This article:
what is pci express, agp vs. pci express, pci express review, pci express faq (http://www.geeks.com/techtips/2005/techtips-031005.htm)
Give a fuller explanation.

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