Front side bus

[Phillip]

Can someone help me understand this situation? For example sake, I have two
cpus
one is a P4 2.4 ghz FSB 800mhz and the other is P4 2.4 ghz FSB533 mhz, a mobo
with a FSB 800mhz. I am really confused about the difference in cpu FSB and
mobo
FSB speed. Can anyone help me understand what the difference is or any info
on this subject? Thanks, Phillip

 

[Thee Chicago Wolf]

Can someone help me understand this situation? For example sake, I have two

cpus
one is a P4 2.4 ghz FSB 800mhz and the other is P4 2.4 ghz FSB533 mhz, a mobo
with a FSB 800mhz. I am really confused about the difference in cpu FSB and
mobo
FSB speed. Can anyone help me understand what the difference is or any info
on this subject? Thanks, Phillip

It partially boils down to what the hardware of the motherboard can
support. 533 FSB is found on older motherboards and is usually a
combination of it supporting an actual CPU bus speed of 133.33 MHz * 4
to give you 533.33. On one that's 800 FSB, the actual CPU bus is
operating at 200 MHz * 4 to yield 800 MHz FSB. It usually requires a
more modern chipset that can take advantage of the CPU's higher bus
speed. Kapish?

- Thee Chicago Wolf

 

[Phillip]

Thanks for resonding so quickly. Still not sure, so let me ask this. Does
that mean that on an 800mgz mobo and you have 533mhz cpu, the fsb is actually
running at 533mhz? And if you had a cpu with a 800mhz, the fsb would be
running at 800mhz?
I am confused about the two tems mobo fsb and cpu fsb!!!!!!!

 

[Thee Chicago Wolf]

Thanks for resonding so quickly. Still not sure, so let me ask this. Does

that mean that on an 800mgz mobo and you have 533mhz cpu, the fsb is actually
running at 533mhz? And if you had a cpu with a 800mhz, the fsb would be
running at 800mhz?
I am confused about the two tems mobo fsb and cpu fsb!!!!!!!

It is confusing but you do have the gist of the idea. If you plug a
CPU that only runs up to 533 FSB into a motherboard that CAN run at
800 FSB, the CPU will run at 533 FSB. Upgrading to a CPU that runs at
800 FSB and putting it into the motherboard will mean the CPU FSB can
now reach 800 FSB. FSB, whether the rating of the CPU or the
motherboard has to do with the bandwidth afforded by the top FSB
setting the motherboard can handle. Theoretically, I *think* you can
put an 800 FSB CPU in a motherboard that tops out at 533 FSB and this
will drop down the 800 FSB CPU to a lower performing 533 FSB. It's all
about synchronicity and asynchronicity.

- Thee Chicago Wolf

 

[Phillip]

Thanks, a really good simiple explanation. I got it now, thanks again. Phil

 

[Lil' Dave]

--
Dave

Can someone help me understand this situation? For example sake, I have
two
cpus
one is a P4 2.4 ghz FSB 800mhz and the other is P4 2.4 ghz FSB533 mhz, a
mobo
with a FSB 800mhz. I am really confused about the difference in cpu FSB
and
mobo
FSB speed. Can anyone help me understand what the difference is or any
info
on this subject? Thanks, Phillip

There is a clock that the cpu uses for internal timing. All clocks
originate from the motherboard.

The cpu has a multiplier, internally, that multiplies one of the motherboard
clocks for its own purposes. Yielding the actual speed of the cpu.

RAM used to use the same identical clock. Now, that is different.

Dave

 

[NoConsequence]

Can someone help me understand this situation? For example sake, I have two
cpus
one is a P4 2.4 ghz FSB 800mhz and the other is P4 2.4 ghz FSB533 mhz, a mobo
with a FSB 800mhz. I am really confused about the difference in cpu FSB and
mobo
FSB speed. Can anyone help me understand what the difference is or any info
on this subject? Thanks, Phillip

Sure. There are THOUSANDS of web pages to explain this. Try a search
in Google and do your own research.

Besides, this has nothing to do with XP and is basically a purely
hardware question. Take it elsewhere.

 

[M.I.5¾]

Sure. There are THOUSANDS of web pages to explain this. Try a search
in Google and do your own research.

Besides, this has nothing to do with XP and is basically a purely
hardware question. Take it elsewhere.

Of course, its always possible that the OP's lack of understanding is such
that he does not appreciate that it is not an Windows XP issue.

But then such niceties are of NoConsequence to the usenet nazis.