The Mobo clock will be 100Mhz, it will be quad pumped and multiplied on the chip do derive youy 1.7Gig operating bandwidth.
The same Motherboard clock will be scalled differently to provide Ram clock, but will be syncronised with the CPU (being derived from the same source)
Your Pa A,B,C info is correct regarding FSB.
The processor has to execute many simple instructions to perform a basic high level instructions. And may take an average of 4-6 clock cycles per instruction, so memory speed does not need to ba no where near as fast to keep pase. but as CPU speed increases, so does Memory speed to keep the effective performance ratio the same.
The higher the speed on the mobo, ie running 400Mhz say would require very tight timings between i/o channels, hence processor it's self scales the frequency.
With 200Mhz Mobo clocks and high speed DDR, these are already putting a strain on Mobo desing, matched trace lengths, matched impedances...
The only real bottle neck is the CPU, it's got very little onboard memory (256k vs 512 of a Northwood) and has to do a lot more swaps of data to and from the SDRAM you have on the MoBo,
So what's the real problem, you pissed with the performance?