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

#### Tipycol

##### Member
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)?

#### jazztrumpet216

##### Senior @ss
It's like the P3. Just forget the pipeline jazz to figure the multiplier, it's speed/FSB.

OP
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#### Tipycol

##### Member
K Thanks...so P4 boards have multi options to 23 and higher? That's a lot

#### batboy

##### Senior Moment
Yep... also, the s-spec page at the Intel site lists the multipliers.

#### oops

##### Member
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
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
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.

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.

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#### Tipycol

##### Member
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.

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