Maximus:

3875MHz


P5b(!):

4020MHz




Maximus:

3958MHz

P5b:

4032MHz




Maximus:

520MHz


P5b:

510MHz




Maximus:

611MHz 5-5-5


P5b:

566MHz 5-5-5




So, there is a significant improvent in FSB Freq. and RAM Freq. But the max cpu freq. is very bad. It could be because of other reasons...