Not really, no. The "Memory clock" is the speed of the chips themselves, separate from any quad-pumping of the bus and is really an obscure thing. For all intents and purposes, you can consider the "Bus clock" the working frequency of the stick just like 500MHz on DDR2 (PC8000) was really 500MHz.

You can see that when you divide the "PC ratings" in his chart by 8, you get the DDR spec, and when you divide that figure by 2, you get the classic frequency put in the DDR2 frame of mind we're all used to.