Marginal!!!It has shown marginal to almost no improvement of capabilities over AGP 8X.
pft, perhaps that was true of the first generation PCI express cards, but not anymore...
the new 16x cards have nearly double the bus capabilities and transfer rate of even AGP 8x cards...
http://www.gamepc.com/labs/view_content.asp?id=pciegpuso&page=1&cookie_test=1Double The Bandwidth - PCI Express X16 slots have peak bandwidth levels of 4.0 GB/s (up to 8.0 GB/s bi-directional), compared to 2.1 GB/s of AGP 8x
AGP has had it's day, Long live PCI ex.