What are the risks of running a 100Mhz FSB processor on a 133Mhz FSB Motherboard?

[x86]

For example, running a P4(100) on an official 133Mhz FSB motherboard with the new 845E chipset? Another example is running an Athlon(100) on a 133Mhz FSB. Would overheating be the only factor?

Thanks

-x86

 

[Derango]

You can slow down the motherboard FSB to 100. No problems there. Although I'm running my northwood at 133mhz FSB. Works like a charm. Of course, its a northwood...

 

[Athlon4all]

Absolutely no problem.

 

[x86]

Then what is preventing people from ripping AMD or Intel off?

 

[ViRGE]

The fact that most CPUs won't run reliably at a speed 33% faster.

 

[RanDum72]

A 100mhz FSB CPU doesn'thave to run at 133 on a board that officially SUPPORTS 133 since what it means is that it usually supports 100mhz FSB operation also. If the multiplier is locked and you run a 100fsb CPU at 133FSB, you are overclocking it. Everyones mileage varies depending on their CPU sample, their motherboard and cooling.

 

[FishTankX]

Allright, X86, just to answer a few questions.

The i845E and it's ilk have a *maximum* supported frequency for operation of 133. Thus, you're 100MHZ FSB processor is well within spec.


Remarking on the P4 could only occur with the 1.6A and even then nobody would dare because intel is gonna phase those parts out soon. not all 1.6A's can run at 133 without a voltage bump. WindowsXP reads the microcode of the CPU and detects what kinda CPU it is and then tells it's overclocked speed, that'll circumvent all but the most persistent of remarkers.