If it is at all slower with 8X bandwith, it'll be barely noticable.
I think 7900 cards will probably use roughly the bandwith of 1.5 to 2 PCI-E lanes. the 8800's use roughly the bandwith of about 3 PCI-E lanes. Possibly 3.5 for GTX's and Ultra's
If it is at all slower with 8X bandwith, it'll be barely noticable.
I think 7900 cards will probably use roughly the bandwith of 1.5 to 2 PCI-E lanes. the 8800's use roughly the bandwith of about 3 PCI-E lanes. Possibly 3.5 for GTX's and Ultra's