Celeron 500MHz running at 6 x 83MHz

Chris Robinson wrote:
 > hey,
 >
 > does anyone know any reason why a celeron 500MHz running at 6 x 83MHz would
 > run any less reliably than the same processor running at 7.5 x 66MHz...?
 >
 > just wondering if it makes any difference at all...
 >
 > chris
 >
 >

Rather hypothetical since the multiplier is locked and you can't do it. However,
some PCI cards, and old hard drives, have problems with 83.3 MHz FSB because
that puts the PCI bus at 41.6 MHz.

You might be able to get the 500 to 75MHz FSB (even here some old hard drives
had problems) for 563MHz, probably need to increase Vcore to 2.1, 2.2, or 2.3
volts, but that's about as fast as the PGA celerons will reasonably go.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Celeron 500MHz running at 6 x 83MHz 

Nitza666 wrote:
 >
 > Multipliers are locked on Intel CPUs so you cant choose 7.5 or 6 the 500MHz
 > celeron comes with a 7.5x multiplier and cant be changed and if you could
 > run at 6x83 to get 500MHz it would be faster than the 7.5x66 because of the
 > higher FSB BUT far less reliable since you get a 41.6MHz PCI bus speed at
 > 83MHz FSB.

This doesn't seem to be quite true. I'm running a 400mhz pentium 2 on a
old lx motherboard at 5.5 x 66mhz. Running at 100mhz on a bx board the
multiplier was locked at 4 though.

James<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Celeron 500MHz running at 6 x 83MHz 

James Grabowski wrote:
 > Nitza666 wrote:
 >
  >>Multipliers are locked on Intel CPUs so you cant choose 7.5 or 6 the 500MHz
  >>celeron comes with a 7.5x multiplier and cant be changed and if you could
  >>run at 6x83 to get 500MHz it would be faster than the 7.5x66 because of the
  >>higher FSB BUT far less reliable since you get a 41.6MHz PCI bus speed at
  >>83MHz FSB.
 >
 >
 > This doesn't seem to be quite true. I'm running a 400mhz pentium 2 on a
 > old lx motherboard at 5.5 x 66mhz. Running at 100mhz on a bx board the
 > multiplier was locked at 4 though.
 >
 > James

The P-II was in a transition period. Later ones were locked but some earlier
ones were multiplier limited. It would seem you have one of the limited ones.

The poster is correct if you restrict that to 'late model' Intel CPUs. It's also
true for the Celeron 500.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Celeron 500MHz running at 6 x 83MHz 

thanks guys...

another question... seeing as the speed and multiplier are set by the cpu,
if i plug it into a mainboard that is guaranteed to support the 66MHz clock
speed, will it operate correctly regardless of the multiplier set by the
cpu...

or are there limits to how high the multiplier (and therefore overall speed
of the chip) can go...

the reason im asking is that im planning on plugging the chip into a
mainboard that says it supports 300MHz, 333MHz, 366MHz, 400MHz, and "faster"
cpu's... and im not really sure what "faster" entails...

chris


"David Maynard" <dNOTmayn.RemoveThis@ev1.net> wrote in message
news:3F5BC3C1.5040209@ev1.net...
 > Chris Robinson wrote:
  > > hey,
  > >
  > > does anyone know any reason why a celeron 500MHz running at 6 x 83MHz
would
  > > run any less reliably than the same processor running at 7.5 x 66MHz...?
  > >
  > > just wondering if it makes any difference at all...
  > >
  > > chris
  > >
  > >
 >
 > Rather hypothetical since the multiplier is locked and you can't do it.
However,
 > some PCI cards, and old hard drives, have problems with 83.3 MHz FSB
because
 > that puts the PCI bus at 41.6 MHz.
 >
 > You might be able to get the 500 to 75MHz FSB (even here some old hard
drives
 > had problems) for 563MHz, probably need to increase Vcore to 2.1, 2.2, or
2.3
 > volts, but that's about as fast as the PGA celerons will reasonably go.
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Celeron 500MHz running at 6 x 83MHz 

Chris Robinson wrote:
 > thanks guys...
 >
 > another question... seeing as the speed and multiplier are set by the cpu,

Well, the multiplier is set by the CPU. The "speed" is set by the multiplier
times the FSB clock the motherboard runs at. The CPU tells the motherboard what
FSB it WANTS but the motherboard has the final say (which is why overclocking by
raising the FSB works).

 > if i plug it into a mainboard that is guaranteed to support the 66MHz clock
 > speed, will it operate correctly regardless of the multiplier set by the
 > cpu...

Assuming everything else is working properly, yes.

 >
 > or are there limits to how high the multiplier (and therefore overall speed
 > of the chip) can go...

Yes, the speed capability of the CPU.

 >
 > the reason im asking is that im planning on plugging the chip into a
 > mainboard that says it supports 300MHz, 333MHz, 366MHz, 400MHz, and "faster"
 > cpu's... and im not really sure what "faster" entails...

Motherboard manufacturers generally list processors they know exist, and work,
at the time of release. "And faster" generally means they've followed the Intel
design guidelines and so it should be compatible with 'future' processors of the
same family type, unless Intel blind sides them and changes the specs.

Since the CPU sets the multiplier it makes no difference what the motherboard
does about it. The impact would be if the motherboard reports the right speed at
post but that is of no real significance, usually. I say usually because there
is the occasional motherboard that will refuse to do anything unless it 'knows'
the processor but those are almost always motherboards in 'brand name' computer
systems like Compaq, HP, or Dell (not to say theirs always do but I've seen some
[rare] that did). If you're looking at a third party, direct to the consumer,
motherboard then virtually all of those will try to run regardless.

The most amusing post I've gotten was from a Compaq that reported "Future
Celeron 600." Who says you can't go into the future?


 > chris
 >
 >
 > "David Maynard" <dNOTmayn DeleteThis @ev1.net> wrote in message
 > news:3F5BC3C1.5040209@ev1.net...
 >
  >>Chris Robinson wrote:
  >>
   >>>hey,
   >>>
   >>>does anyone know any reason why a celeron 500MHz running at 6 x 83MHz
  >>
 > would
 >
   >>>run any less reliably than the same processor running at 7.5 x 66MHz...?
   >>>
   >>>just wondering if it makes any difference at all...
   >>>
   >>>chris
   >>>
   >>>
  >>
  >>Rather hypothetical since the multiplier is locked and you can't do it.
 >
 > However,
 >
  >> some PCI cards, and old hard drives, have problems with 83.3 MHz FSB
 >
 > because
 >
  >>that puts the PCI bus at 41.6 MHz.
  >>
  >>You might be able to get the 500 to 75MHz FSB (even here some old hard
 >
 > drives
 >
  >>had problems) for 563MHz, probably need to increase Vcore to 2.1, 2.2, or
 >
 > 2.3
 >
  >>volts, but that's about as fast as the PGA celerons will reasonably go.
  >>
 >
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Celeron 500MHz running at 6 x 83MHz