'tis true. Most memory manufacturers are warning about this. A quick
Google should give you the details.

--
Richard G. Harper [MVP Win9x]
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
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"Rick T" wrote in message
...
Kelly wrote:
I am trying to upgrade from a 64mb to a 128mb Ram.My
computer says It has a Celeron 900MHXZ/100MHZ. When
shopping I find a message that PC133 Moduels are no longer
backward Compatable with Pc 100 Machines.

Really? Where'd you hear that ?

What is a PC133
mod. and how does it differ from a PC 100. Is the Pc 133
module faster than the 100? If I can get one of the
original compatable pc133 modules for my compute will it
be a better choice than a PC 100 module? CONFUSED

Rick