Upgrade processor to Compaq Presario CQ56

I need to know what is the best processor currently on the market that I can buy the laptop Compaq Presario CQ56 laptop. I currently have the Intel Celeron inside. In my opinion, it's 2.20 Ghz.  I want just to upgrade this computer to its maximum capability. The product number is XY871UAR #ABA.

Hello:

Here is the link to the service manual for your laptop.

http://h10032.www1.HP.com/CTG/manual/c02657369.PDF

The best processor you can upgrade is the Pentium T4500.

I do not see the processor listed on the Intel Web site, but I noticed that it also.

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