OK, thanks for the info, I thought it was as simple as removing one pin but I couldn't remember or find a link.
I actually bought a Celeron 1.6 mobile (Northwood core with 256K L2) and am going to swap that out with a Inspiron 2.8GHz B from my Dell. It only has a Radeon 7500 32MB video chip good for light to medium gaming only. I am sure 2133MHz will give the same video performance as the 2.8 as long is it stays on a 533MHz fsb. From everything I have read the mobile Celerons with 256K L2 cache perform within 5% of its 512K brother. The other benefits are heat reduction and increased battery life, the 1.6 mobile runs a default 1.2v even at 2133MHz.
A short gaming excursion on the 2.8 Inspiron gets real hot and makes battery life miserable.
The 2.8 will see duty on a desktop at 3.0GHz+.