how to lower down the AGP divider???

[lightning]

i had Abit VP6 mobo, and i just wondering why ppl taking about lower down the AGP divider. i know i can lower down the pci divider to 1/3 or 1/4!! but i can't find any option in my bios to lower down the agp divider?? or maybe this function does not exist in my mobo?? what is the benefit to knock down the agp divider?? :)

[Door Knob]

I can't do neither with my board. Knocking down the devider would allow you to keep the agp bus speed down. Making your graphics card more reliable. Rember, raising the bus speed of your agp does not inprove performance, it can only hinder it.