Internal clock, System clock, Multiplier, FSB, RAM frequency, PCI operating speed

[Merrvyn Tay]

Dear Friends,

1) I have some enquiries to make over the following "beefy" terms:
Internal clock, System clock, Multiplier, FSB, RAM frequency and PCI operating speed

2) I have a program called WCPUID which measures the above operating specifications as follow:
Internal clock = 1800Mhz
System clock = 100Mhz
Mutliplier = 18
FSB = 400Mhz
RAM frequency = 133 Mhz (operating)
PCI operating speed = N.A

3) I only have the knowledge that:
Internal clock (1800Mhz) = System clock(100Mhz) x Multiplier(18)

4) May I enquire if there is any link between other components? Please verify against my below statements, which I read somewhere.
System clock = FSB/4 ??
PCI operating speed = FSB/2 ??
RAM frequency = ?? Any mathematical link

Kindly refer me to relevant PC articles in the website if possible.

Thanks alot,
Merrvyn