The problem is some AMD/ATI cards did not work with early PCI-E 1.0 chipsets.
The G41 and G31 did not have that problem. It is only the pre-G31 chipset that has that issue.
i believe you're mixing up pci-e 1.1 with pci-e 1.0
there were a lot of problems with pci-e 1.1 and its general comparability with any
other type of pci-e