At 19:02 27-06-98 -0400, William Aguero wrote:
>Maybe someone can clear up a little confusion here.
>Does the System Bus of a SE440BX Intel Motherboard run at 100 MHZ
>with any Pentium II processor or only with a Pentium II 400 MHZ ?

Officially, BX motherboard system buses run at 100 MHZ for 350 and
400 MHZ Pentium II processors. Some BX motherboards will detect
*recent* 333 MHZ (or slower) Pentium II processors as such and
refuse to run them at 100 MHZ. (They would then run the bus at 66
MHZ, or possibly allow 75 or 83 MHZ.) There is a trick (tape or nail
polish on some pins of the Pentium II) that will allow you to bypass
Intel's scheme for forbidding 100 MHZ on these "locked" 333 MHZ and
slower chips. Some BX motherboards (Abit BX6 for example) are not
affected by Intel's lock and will let you run your system bus at
100 MHZ (or even up to 133 MHZ) with any Pentium II. Older 333 MHZ
and slower Pentium IIs may let you clock the system bus at 100 MHZ
without modifications on any BX motherboard.

Just because you can set the system bus for 100 MHZ for a 333 MHZ or
slower Pentium II (with or without modifications) does not mean the
Pentium II will function reliably (or at all) in this over clocked
state. There could be overheating problems, or problems with the
Pentium II's processor or it's L2 cache, or problems with your SDRAM.

Only 350 MHZ and faster Pentium IIs are guaranteed to run with the
100 MHZ system bus and PC100 SDRAM.

Regards,
Bill