Would a 533 Mhz FSB processor work in a 400 Mhz motherboard?

Hi all!

Will it scale down to 400 Mhz, or won't it work at all?

I am asking because the fastest CPU that my machine can
take is P4 2.6 Ghz, 400 Mhz FSB. But I am having trouble
finding 400 Mhz FSB cpus, whilst there are plenty of
533 Mhz FSB cpus on ebay.

Thanks in advance!

Buck

 

http://www.starmicro.net/detail.aspx?ID=138




With best regards, TheGarbageGuy. E-mail:

 

Hey, I think I found the answer to my question!

http://forumz.tomshardware.com/hardware/533mhz-FSB-P4-ftopict58486.html

And the OP even has the same board chipset as me, so we're in
the exact same boat!

 

IF (A BIG IF) the 533MHz FSB CPU is recognized by the system BIOS, it will run
at 400MHz FSB. But it's speed will be 400/533 x (rated speed). P4 and Celery
CPUs are clock-locked, which means that the clock multiplier is fixed and the
bus clocking is generated by the motherboard during the early phases of Power On
Self Test (POST).

The newer lower-voltage P4 CPUs with funky numbers (e.g. Pentium 4 D 322) are
not recognized by the BIOS in an older Dell P4 system, e.g. Dimension 2400 or
earlier, Dimension 8300 or earlier, etc... Ben Myers

 

Ben, dont forget to take the number of pins into consideration ... 603 v
604. If the 533 is a 604, and the 400Mhz board is a 603 .. the answer should
be no. however, i have heard of guys breaking that pin off and having it
work, the reason being for overclocking purposes, or some such thing.

 

Which machine model and number. Yes, that may mean only everything.

 

603 or 604? Aren't we talking P4 technology here? Socket 478 vs LGA 775,
which cannot be confused? These ARE Dells, a bastion of 100% Intel CPUs... Ben
Myers

 

::::::::::blank stare::::::::::::::

478-pins...... (g)



Stew

 

uhm ... Xeons.

sorry ... its all i deal with, so i tend to forget the desktop and consumer
sectors ...

- NuTs