Difference between P4 Proc's 400MHz bus and 533MHz bus

[Ravho]

Could someone please explain the difference between the two? The newer and higher clocked Intel Processors have the 533Mhz bus while the 1.6a and 1.8a's for example have the 400Mhz bus.
Thanks,
-Rav

 

[toft-dk]

The newer ( 533 ) p4's have a higher memorybandwith than the old ( 400 )

 

[BuddyAtBzboyz]

the 400s have a quad pumped 100mhz fsb and the 533s have a 133mhz quad pumped fsb. This makes some of the 400s better overclockers since lower multiplyers are better for achieving the high fsb overclocks.