here's the FSB story:
the mobo does run the bus to the CPU at full 100x4 = 400mhz bus speed. BUT: the RAM defaults to 266 (which is 133x2) because 133:100 (memory:CPU) is the same as 4:3 ratio, which is easy for the mobo to do. 166x2=333 would be 166:100 which would be 5:3, which isn't really possible on most boards, this one included, i'm sure.
if you slap in a 533mhz chip, it will run the CPU bus at 133x4 = 533mhz bus speed and the mobo can do the ram at the 166x2 = 333 becuase 166:133 = 5:4 which is easy for the mobo to do. don't ask me why, but that's just the way the 400 and 533fsb mobos work.
so, if you have 333 (pc2700) RAM, you're all set should you decide to upgrade to a much faster 533 chip in the future.
