On 7/10/2015 1:21 PM, Joe Giliberti wrote: I don't recall there being any different processors in the first Pentium. The big effort in power reduction was by a group who did a power reduction project with the Pentium 3. Many of the laptops had full sized Pentiums with novel cooling to make them work in a portable laptop form factor. There were a series of projects where Intel did processors to upgrade previous families of chips with the newer technology. For example a 486 chip engineered to be happy with a 386 pin bus, but running at a higher clock, and similar upgrades for 486 systems. These were called "Overdrive" and were not power reduced as a goal of the product. The Pentium was a big enough step that I don't know of any such for the 486, where a Pentium could be stuffed in. The BIOS became enough of a factor in making the Pentium go that it was necessary. Such dropins they had were all self contained that I mention in the previous paragraph. The next act for Pentium (and quoting from this article) was MMX added in. Pentium II of course went to the infamous Slot 1 / 2 form factor. https://en.wikipedia.org/wiki/List_of_Intel_microprocessors#32-bit_processo… If you look up the processor you have in your Omnibook, some of the Pentium P5's could be upgraded, but you had to be careful as some had issues of being interchanged. Thanks Jim