I worked on a Dell XPS notebook last week. The main issue was freezing, crashing and it refused to boot. I removed the (2) fans on the bottom/rear of the notebook to find that the fans as well as the heatsinks were completely clogged with dust. Cleaned them out... Then installed "speed fan" which has a "Dell Notebook - feature"...
P4 3.4 Prescott - Temp: 91C...!!! with big red flames...
I was like holy... crap!!!!
Even with a notebook cooling platform I couldn't get it lower then 70C.
Why anyone would think about putting a 3.4 pressy in a notebook is beyond me?