BIOS settings: PCI-E bus, FSB, CPU speed (which is which?)

[davidstone28]

On my Asus A8N Premium, there are seperate options for:

1. CPU speed (200mhz, 201mhz, 202mhz etc)
2. PCI-E bus (100mhz, 101mhz etc))

What is increasing the PCI-E bus supposed to do? Is it the same as FSB?

Why are there seperate options? So does say PCI-E 102mhz and CPU speed 202mhz result in 2004mhz?

[Agent]

In older systems, your FSB ran the majority of things on it.
If you increased your FSB, your AGP bus speed would increase, your PCI bus speed would increase, and your CPU speed would (FSB x Multiplier)
Later on in Nforce 2 based boards, AGP had a separate timing chip, meaning that changing the FSB would not affect AGP bus speed.

This is the same concept for PCI-E. It literally has its own bus, so you can overclock your CPU without it effecting PCI-E devices.
Its more to do with the way the HTT works though than it being like that for the sake of overclocking.

If you want more detail on the way HTT works, just ask, although im guessing the above has answered your initial question