NB Core Clocks on Intel chipsets
Hi,
I sort of saw that coming. has noone here had a P5B Series board before?
You should read the article on FSB straps and NB clocks on the P965 chipsets. I don't have hard evidence so far that the X38 is behaving the same, but the intel chipsets are all VERY similar. They just evolve bit by bit but don't ditch their whole architecture. The northbridge clock on P965 chips is calculated the following way:
NB core clock = (CPU max multiplier / CPU current multiplier) * FSB clock
ex. if you are running a E6600 at 3.6 GHz, you have the option to use 400*9 or 450*8.
The NB however runs at either 506 MHz (9/8)*450 or in the latter case at (9/9)*400.
This is also the reason why you should disable speedstep whenever you are overclocking. The further the multiplier goes down, the more the NB cklock goes up with the FSB clock remaining constant. At some point the voltage for the NB core gets insufficient and the computer crashes.
There was a good article on xtremesystems, on FSB straps on the ASUS P5B Deluxe board. Trying to hunt it up and add the URL to the posting as soon as I find it.
--- Edit! ---
Here is the article:
http://www.thetechrepository.com/sho...hp?p=32#post32
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Quote:
Originally Posted by
Lestat
what!??
are you saying one setting you use is 436 FSB 8x cpu multi
and another seting you use is 490mhz fsb and 9x cpu multi ?
if not then i do not understand where your getting those numbers.
the FSB is what it is,, its not times or divided by anything else...
400mhz FSB is 400MHz whether you use a 6x multi or a 10x multi. all the multi does is simply increase your default cpu speed.
cpu multi also doesnt change your ram speed
OR are you saying your ram is 490mhz ???
thus 436x8 = 3488
436x9 = 3924
490x8 = 3920
490x9 = 4410 - and you are not doing that with this board unless its a dual core. you wont do 490 x 9 on a quad with this board. not on air or water atleast.