For AMD Athlon processors the friggin' Front Side Bus only
goes from 100 MHz to 200 MHz (100,133,166,200) NOT 200 MHz
to 400 MHz! It is easier to teach a newbie the right way
than to correct the wrong way later.

Fhew... I feel better now...

They actually go from 50 to 200 (supported)
and slightly more extreme on both ends..
But yes
Amd AND intel chips are all currently markted in the QDR or DDR values and
that's what users see/hear