Hello- being new to the site I am hoping that someone might be able to give me some information. I just purchased a used HP Pavilion ZE5270 with 2.4GHz P4 socket 478, and I've read that some folks experienced an overheating problem because HP used a desktop P4 in this model. I have looked this up and that model runs at about 59W, whereas the P4 Mobile 478 socket runs about 35W. My question is whether or not switching to the mobile processor would be possible- I think this would give the laptop a longer run on a battery charge, and alleviate or reduce the heating problem. The mobile processors are available for very little money on eBay, and I thought this might give the older machine a little longer lifespan. If the FSB speed and cache specs are the same, shouldn't the processor be compatible? Thanks for any help!