are ther any other uses for a PCI x16 slot other than a videocard / physX card ?
Currently the sound card is installed in the second slot to avoid a not always well known problem of XP's resource sharing issues generally seen on AGP board while not ruling that out for a PCI-E model.
XP didnt really have that problem, if you were running 98-ME with a AGP card it was recommended not to use the first PCI slot next to the AGP slot because of IRQ sharing problem because the AGP ran off the PCI bus, but it didnt happen with XP. Plus it not a problem with PCIe at all because it doesnt run off the PCI bus.
It's not pointless just an old issue that's rarely seen now with SP2 and other updates since as well as running PCI-E most often instead of AGP. The recommendations seen in some now rather outdated articles then was to simply move the card over a slot or two on the older boards that saw 4 or 5 pci slots there.