9600 will run fine on a pciex16 1.1 slot. it will run at its full potential in all aspects .
any improvement you see in mobo's sporting pcie 2.0 is due other components ( like northbride,southbridge etc.. ) and not due to the higher badwidth offered by pcie 2.0
correct. There is really no advantage to getting a PCI-E 2.0 slot right now, and even when everything is up to snuff in the latest PCI-E 2.0 department, I doubt that there will be any major increase in performance from 1.1 to 2.0. I asked this same question a while ago too