What kernel are you running?
I believe, that the 2.4 series does not have pci-express support (could be wrong on that with a current release).
I am running a recent 2.6 series (2.6.15.4) and pci-express is a kernel option.
And has been for a while in the 2.6 branch.
My video card section in xorg.conf
Quote:
Section "Device"
Identifier "Card0"
Driver "nvidia"
VendorName "nVidia Corporation"
BoardName "6800GT PCI-Express"
BusID "PCI:5:0:0"
Option "RenderAccel" "true"
Option "NoLogo" "true"
EndSection
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As you can see I have nothing special in there. Just make sure that support is compiled into the kernel you are running.