3rd paragraph from the bottom in Info.Overclock SA & Kinetic:
"Interstingly the 133MHz RAM on the Kinetic is run at 66MHz. As the
main speed increase for this card comes from the speed of this RAM
vs the rather slow motherboard RAM it follows that you could double
this frequency for a BIG performance boost - in theory.
I assume that there's a good reason why Castle chose not to do so."
I was under the impression this used DDR memory, where data is
retrived on both the rising and falling clock edges, thus delivering
an effective 133MHz 32b bandwidth at 66Mhz over a 64b bus.