But what good is the 800 MHz FSB when the memory is only good for 400 MHz
isn't the true speed the lowest common denominator

Nate Edel wrote:

Matias wrote:

Hi there, do you actually get 800 MHz on the front side bus or are you limited
by the memory clock speed, i.e. DDR 400?


Actually, you get 200mhz on the front side bus... the P4 bus is QDR
("quad-pumped") so you get an effective 800mhz transaction rate on a 200mhz
clock.

That said, you only get the full 6.4gbytes/sec (800mhz * 8 bytes on a
64-bit-wide bus) if you have a dual channel memory system...