Agp (pci Mode)

[Neomorpheus]

I've got a NVIDIA Geforce Ti 4800 se on Windows XP

In the adapter information it says
Bus: AGP (PCI mode)

Does this mean its not running as fast as it should?
As I have a 8x AGP capable motherboard.

I shouldn't have to make any changes in the bios because
I've noticed in win 98 (i have dual boot) it says

Bus: AGP 8x

Any ideas how to set it to 8x in XP?

Thanks.