You might be able to upgrade the CPU in the Mobile chip as AMD Mobile can be upgraded in HP/Compaq models depending on what you have for a model but you should be able to. The old Intel PIII Mobile on DELL C600 series can be swapped out also. On those if you had 850MHz you could put in 1.0GHz . I have the Compaq version of HP and my AMD Mobile CPU can be taken out and put in a different AMD CPU. The Intel versions you're stuck...