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I wonder if i can upgrade from the Celeron 900 to a core 2 duo or a better one? Please email me or answer to this question. Thanks for your help Update (10/24/2016) Can the T7250 or the T7300 work with Socket P 478? Or I have to find another model?

Just to be clear, the GPU is what is integrated. you can see that is evident when looking at the Motherboard that the CPU can be replaced

here is a page that shows you a list of the CPUs that your Laptop will support. Hope this helps :) http://www.cpu-upgrade.com/mb-Intel_(chi