Curious - along with the benchmark set posted above, along with another load done by that website concerning witches' magic, would say otherwise.
P4s @ 250MHz FSB w/ 3-3-3-8 timings performed no better than the same chips @ 200MHz FSB w/2-2-2-5 timings.
I think a more accurate way of putting such a statement across would be that Intel-based systems suffer less of a hit when twiddling with latencies than AMD-type ones due to the processor designs, but they still get it in the knackers.
Obviously, with DDR2-800, etc. the story will undoubtedly be somewhat different, but the margins - extrapolation required - would not be huge. At all.