As an example, and I hope this question makes sense...

Some Pent. 4 PROCESSORS have a FSB speed of 400 MT/s  (quad pumped) , which would leave the FSB between the CPU and North Bridge at a speed of 100 MHz...

Is that 400 MT/s confined to the inside of the CPU or is it used across the FSB (between the CPU and North Bridge) as well?



I'm trying to determine what speeds to base "ratios" on.  For example, DDR 400's base speed is 200 MHz.  Say that DDR is used in a system with a FSB of 200 MHz (quad pumped being 800 MT/s)...  So do I base the RAM/FSB "ratio" on the base speeds or the "pumped" speeds? 

In other words, would the ratio calculation here be 1:1 (using the DDR's base speed of 200 & FSB's base of 200)






 

I don't normally quote wiki but this seems pretty THOROUGH...
http://en.wikipedia.org/wiki/Front_side_busshoot, I while back I checked that Wiki page and didn't find my answer, but I just checked it again and apparently I missed the "memory divider" link.  I've been reading through it for a while now and "ratios" seem much more clear...   I don't think I've been using the TERM "ratio" correctly for a while... 

thxNo problem...I ASKED Rodney Reynolds of 3dGameMan a similar question through E-mail. He sent me this:
Quote

It's a combination of FSB (memory clock speed) and CPU multiplier that equals CPU speed. http://www.youtube.com/watch?v=CTHRYDiYHQY

I asked Rodney Reynolds of 3dGameMan a similar question through E-mail. He sent me this: