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How do you find the multiplier of the P4's?

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Tipycol

Member
Joined
Aug 20, 2002
I know that with a P3, you'd just divide you MHz by the fsb and you get the multi (1400/133 = 10.5). But with the P4, since it has the 4 pipelines, is it MHz divided by 4 divided by fsb (ex: 2200/4/100 would have a multi of 5.5)? Or is it still like the P3 (2200/100 would have a multi of 22)?
 
OP
T

Tipycol

Member
Joined
Aug 20, 2002
K Thanks...so P4 boards have multi options to 23 and higher? That's a lot :)
 

oops

Member
Joined
Jun 21, 2002
P4 come with 400MHZ(for A processor) or 533MHZ(for B processor) system bus.

400/4 = 100FSB
533/4 = 133FSB

Then use the CPU frequence(MHZ) divided by FSB.

The 2.2GHZ is A processor, so it has 400MHZ system bus,

2200 / 100FSB = 22 multiplier
 

asw7576

Member
Joined
Jan 7, 2002
Location
Jakarta
Still Remains Good Old Days....

Just divide the stated number by fsb of 100 or 133 depending the type of processors. Intel processors greater than 2.4GHz OR with initial B are categorized as 133fsb type of processors.

For examples: Pentium4 2.0 = 2000MHz / 100fsb = 20 x.
Pentium4 2.26B = 2266.66MHz / 133 = 17 x.


thanks looktall.... I wasn't thinking back then.
 
Last edited:

looktall

Member
Joined
Jul 28, 2002
Location
perth.wa.au
Re: Still Remains Good Old Days....

asw7576 said:
Intel processors greater than 2.4GHz OR with initial A are categorized as 133fsb type of processors.

you might want to rethink how you've written that. :D

there are many intel processors that have the A designation that are not 133mhz chips.

the 1.6A P4 is only one that springs to mind.
 
OP
T

Tipycol

Member
Joined
Aug 20, 2002
K thanks guys I got it. The thing that messed me up when I was thinking was the fact that the buses are 400 and 533 on the P4's, so I was wondering which way the multi worked.