James Hanley wrote:

it seems to me that nobody needs a high fsb. since they could just
push the multiplier really high.

I can see the greatness of ddr since the same speed processor can
read/write twice as much per cycle. (i assume that the cpu has to be
ddr to receive or write double)

How is it you can see the benefit to 'read/write twice as much per cycle'
yet not see any benefit to more of the cycles?

The CPU communicates to everything through the FSB, and that includes the
memory, so the speed of it directly affects how fast the processor can
communicate. And since the vast majority of that communication is fetching
instructions from memory, it affects how fast it can process them.