No its not ask YOUR ... erm, anyway, Arstechnica have a good little article up breaking down fsb and memory setups.
"AMD and Intel came out with "double-pumped" and "quad-pumped" system buses, respectively, which increased the effective speed of the FSB. Whereas a conventional bus had one transaction per clock tick, a double-pumped bus had two transactions per tick and a quad-pumped bus four per tick. Thus, on a double-pumped AMD board, a 166 MHz FSB now had an effective speed of 333 MHz (166 x 2, add 1). On an Intel quad-pumped board, a 133 MHz FSB now had an effective speed of 533 MHz (133 x 4, add 1)."
head over here