I believe there's a slight difference between actual ram speed and theoretical ram speed.
Your current ram speed is 166.5 like it or not.
play with the terminology and numbers all you want, that won't change it.
I can take PC 133 ram and put it in a 100Mgh FSB system and it'll run fine.
what's the ram speed now?
It's still 100Mgh no matter what the ram is advertised at because the memory bus speed is still 100Mgh and that's the true ram speed for this system.