wrote:
> My sister-in-law has an aging Dell (Optiplex?) with a 600MHz PIII in
> it. I have an 866MHz Coppermine from a Compaq Deskpro EN SFF. Might it
> be possible to put the 866 in the Dell, or would something blow? Sis
> would like to get a little more time out of this box, which is still
> OK in spite of being loaded with MSN/Kodak/Mystery crapware.
>
> thx,
>
> tf
>
Probably not. There are 2 different types of Pentium III CPU's. The version
used in the old Dell is probably a PIII Katmai, based on a Vcore of 2.0 V
and using a FSB of 100 MHz. OTOH, the PIII Coppermine uses a lower Vcore of
approx. 1.7 V. In addition, the 866 MHz PIII Coppermine uses a 133 MHz FSB.
Even if the Dell is equipped with a voltage regulator that can run between
1.65V-1.7V, the PIII Coppermine will probably run no faster than 650 MHz
(100 MHz FSB times multiplier of 6.5). If the Dell motherboard allows it,
the only way to use the Coppermine CPU at its rated speed would also mean
replacing the RAM with a set that also runs at the 133 MHz FSB.