Zotac Releases GeForce GT 520 With Classic PCI Connector
jones_supa writes "It turns out that you can still get a legacy PCI graphics card with a modern GPU. In this case it's a Nvidia Geforce GT 520 card provided by Zotac. Both the PCI and PCIe x1 variants feature a GT 520 graphics chip with 48 stream processors, 512MB of DDR3 memory, a 810MHz core clock speed, a 1333MHz memory speed, and a 64-bit memory interface."
PCI slots cap at 533 MB/s (and a lot are 133 or 266), which is less than a tenth of most PCIe x16 slots, so I can't imagine that you're going to be making the most of the hardware somehow.
There are a TON of older computers that people still run with PCI slots. They would work just fine repurposed as a HTPC but until now there was no hardware acceleration available. The XBMC Forums will have someone come along that is looking for the "Best" PCI option and usually that involves either an SVIDEO or VGA connector. Some new TVs will have a VGA but not all of them.