Damn! While I was working out the answer, you answered.
Anyway, I'll post this up as a reference. If it's not quite right let me know.
SDRAM:
PC66 = 66MHz FSB
PC100 = 100MHz FSB
PC133 = 133MHz FSB
DDR RAM:
PC-1600 = DDR 200 = 100MHz FSB
PC-2100 = DDR 266 = 133MHz FSB
PC-2700 = DDR 333 = 167MHz FSB
PC-3000 = DDR 366 = 188MHz FSB
PC-3200 = DDR 400 = 200MHz FSB
PC-3500 = DDR 433 = 216MHz FSB
RD RAM:
PC-600 = 300Mhz Memory Bus = 75MHz FSB???
PC-700 = 350MHz Memory Bus = 88MHz FSB???
PC-800 = 400MHz Memory Bus = 100MHz FSB
PC-1066 = 533MHz Memory Bus = 133MHz FSB
Cheers Crash.
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