Why would someone release a new ATI X1300 for regular PCI?  The main reason would be the size, it can be much smaller than a PCI-E card, and work better in tight spaces such as an HTPC setup.  Of course, many HTPC setups do have PCI-E, and there are smaller versions of cards in existance.  Tech Spot’s benchmarking also gives a perfect example of the difference in bandwidth between PCI and PCI-E.
“Although, the Radeon X1300 is predominantly a PCI Express graphics card, VisionTek has ported it to the plain old PCI bus. You are probably wondering why they would even bother doing this, given they already produce AGP and PCIe versions of the Radeon X1300 supporting both 256MB and 512MB of memory. Well, there are a number of reasons why such a card could come in handy, for example HTPCs (Home Theater Personal Computer). These are generally very compact and use a low profile PCI design.”

Here are some more Graphics Card articles from around the web:

Click Here to go to Video Cards   Graphics Cards