It's safe to say that agp has already been replaced by pci express.
AGP was the most common before the PCI Express
pci express (PCIe)
No AGP is older and slower. AGP was superseded PCI Express in 2004.
PCI express is about twice as fast as AGP and will ultimately replace AGP.
No.. AGP is the Graphics Port and PCI Express is Multi-Purpose..
PCI Express
The original IBM compatible parts used an 8-bit ISA slot. After that, they moved to a 16-bit ISA slot. There were other things like a VESA slot that didn't last for long. Then there were PCI slots (not express), and AGP was a faster video card slot standard. Then PCI-express replaced both PCI and AGP.
It twice as fast as Agp x8 and will ultimately replace AGP
PCI express x16 is much faster than AGP.
AGP Ports on a motherboard are "Accelerated Graphics Port" and are traditionally used for graphics cards. AGP was used because it provided a direct, dedicated pathway to the CPU and memory rather then using the PCI Bus. Currently AGP is being phased out for PCI Express which is considerably faster.
The PCI Express x16 is intended to ultimately replace the AGP bus along with the PCI-X and the Conventional PCI.
That's a standard setup for older motherboards.However now PCI Express is becoming the preferred peripheral slot.The largest version of this has greater bandwidth than an AGP slot and has replaced it for high end graphics cards.Obviously PCI express is designed to be far superior to PCI.