Thought I would give an update to my original post if anyone is interested. I obtained an AIW 9200 card which also has dual voltage slots and it works! My only conclusion at this point is that both the 9000 and 9800 Pro cards are bad. I am actually pleased that that the problem does not appear to be the motherboard as I really like this board. Although the PCIe slot is only x4 speed it does accommodate x16 cards and works just fine for capturing using the PCIe AIW cards. So far I have only tested it with the X600 Pro and the X800 XL and they work great. The SATA2 ports are nice to have and it is running a Pentium Dual-Core E6600 CPU which is giving me more than enough speed.
I actually just purchased another AGP board off
Ebay (couldn't resist the price!). It's the ASRock 775i65G which uses the Intel 865G chipset instead of the VIA chipset on the 4CoreDual-SATA2. I plan to test those suspicious cards on this board as well. That should definitively answer the question of whether these cards are bad.