Same results at higher quality with FSAA and Anisotropic filtering.

If we can't find any significant differences between AGP 4x and 8x in games, then we might be able to find some in 3D Workstation applications. As you can see, this is not the case. The FX 5950U is a little bit faster in proe-02 when running at AGP 8x but that's all.

Conclusion? The tests show that there's no real difference in today's applications between AGP 4x and 8x. So if we can't see any difference between 1 GB/s and 2 GB/s bandwidth, then you really won't find any improvements if you scale it to 4 GB/s with PCI Express. Maybe different latency times of the buses can make a difference but it looks like PCI Express won't accelerate anything for graphics.