Quote Originally Posted by shine121
very nice info , thanks tony and astaris
but i still have some stupid terminology to ask?

1. what's the term "strap" mean? FSB of NB?

2. why 533_strap how does it come out to north_multi = 3
the formula "Ram_Freq=2*FSB_freq*north_multi/mem_div" doesnt show the relation between strap and north_multi?

If i ask the wrong question then just tell me shut up or to the google, thanks
The term strap refers to a setting in a northbridge register (north_multi) that in the available bioses depends on three factors:
1) Nominal FSB of the processor (i.e. 533, 800 and so on)
2) Ram ratio selected (i.e. DDR2 533, 667 and so on)
3) The bios programmers team, when a given ram ratio is available through different north_multis
About the second question we have:
Northbridge_frequency=FSB_freq*north_multi
For a chipset strap equal to 533 the nominal FSB_freq is 133, so in order to have the northbridge frequency equal to its nominal value (400), the north_multi has to be 3.