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Question About PCI Express

I have been looking for sometime now but every time I google PCI express I always come up blank. The question I have is can anyone tell me what is the primary difference between an AGP & PCI express video cards.

I know how to find a AGP expansion slot but what I don?t know is what a PCI Express expansion slot looks like how do I identify one?

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Simply go to the website of any mobo

mfr and look at the mobo pictures. You will never find a mobo with both AGP and PCI express 16 socket on them. It's one or the other.

There are a few different PCI Express slots. They come in 4X and 16x. The video slot is 16x and close to the same length as an AGP slot. The 4x slots are only about an inch long.

The PCI Ex bus runs at 100 MHz while the AGP was 64 MHz.

The Gigabyte GA-K8NF-9 that I am instlling now, allows overclocking it to 150 MHz. [that doesn't mean that there are any cards out there that will run at that speed. Just an overclocker's tool.

Their website is giga-byte, someone beat them to gigabyte. LOL

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PCI Express 1x and PCI Express 16x slots..

Some info just checking the Intel site:

"PCI Express is not only designed to replace the PCI bus for devices such as modem and network cards, but also the Advanced Graphics Port (AGP) used for desktop graphics cards since 1997. Unlike PCI, its parallel predecessor, PCI Express is a serial point-to-point interconnect capable of extremely high-bandwidth transfers. Performance ranges from 250 megabytes per second (MBps) for a single "lane" implementation and up to 4 gigabytes (GBps) for the 16 "lane" implementation likely to dominate the AGP-replacement market. Better yet, there's room to grow and for even faster I/O.

As fast as this is, it doesn't spell the end for PCI. Like the 16-bit ISA (Industry Standard Architecture) bus that PCI replaced, PCI will likely be around for some time, used in implementations that don't require the performance gains of PCI Express. In fact, for the time being, many desktops systems will probably offer PCI expansion slots right alongside one or more PC Express slots."
Scroll down for photo of mobo.
In that example there are four standard PCI slots, two PCI Express 1X slots and one PCIe 16X slot or PCI Express for the Graphic Card.

More info:

There is one new chipset that supports both PCI-Express and AGP Graphics, the Via PT880 Pro .....

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