see image attached for system specifications : problem is i want to set FSB to 400 because now it is @333 but evry time i change in bios pc fails to boot and reset the setting to 333 , mobo FSB 1600 , DDR3 @1333 standard ( CORSAIR XMS3 DHX 4GB ( 2 X 2GB ) PC3-10666 1333MHz )
333Mhz is the correct value for your FSB clock.
For memory rated at 1333MHz, the correct FSB is 333MHz with a 5x memory multiplier. From the information you provided, this would appear to be the memory currently in your system (highlighted).
In order for you to have a FSB of 400MHz, you would need memory rated at 1600MHz with a 4x memory multiplier. This memory, again highlighted, would fit that requirement.
Both sets of memory modules are from the Corsair XMS3 DHX Series.
but wait.............befor i had same cpu with same FSB 1333 and my mem was 800
so why not FSB 1600 with mem 1333
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