I have this PC sitting here that I used for games when I got (was good for its time). It only has AGP 4x, not 8x... let alone PCI-E. I want to throw one last good video card in to make it last maybe another 6 months to a year, and I was looking at the AGP version of the Radeon 850XT PE. I know this is a pretty damn good card, but would I notice a huge difference say if I built another machine that had PCI-E? I guess im asking if there is a noticable difference between AGP 4x and PCI-X. Im not sure if video cards have reached the point yet where they can max out the bandwidth of AGP.