Thanks a lot CompuTronix! That post really helped solidify a few things that were nagging in the back of my head from a few Anandtech articles that I didn't quite get 100%.
CompuTronix, riddle me this: I just bought a Q9550 CPU to run on a Striker II Formula using 8G (2G x 4 sticks) of DDR2 800 ram running Vista 64 for gaming. I want performance but I don't want to overclock, or if I do at least not by much, because I don't want to worry about temperature or anything like that.
Am I better off dialing back the ram to get to the 1:1 ratio or leaving everything stock in which case the ram is outpacing the CPU but there is a need, as you say, "to translate the data flow across the FSB between the memory modules and the processor(s)."
Of course, I could dial up the CPU to get to the 1:1 ratio if you PROMISE I won't fry anything! Just kidding and thanks for your wisdom.
At default stock settings, the ratio is 2:3 (266:400 or DDR 800) which can marginally overcome the latency introduced in translation across the FSB between memory and processor clocks, resulting in a marginal increase in memory performance, that typically yields an increase in memory benchmarks of 2 to 3%, as I wrote above.
If you don't want to overclock, then leave the memory at stock.