processor compatibility?

No. just because cpus are the same socket it doesn't mean the board will run them all. You need to determine what motherboard and bios you have. Then, go to the motherboard's website and look up the cpu support for your board. If the cpu you want to use in your upgrade uses the same or earlier(lower number) bios than you have now you can run it. If its bios number is higher then you need to flash your bios to run the new cpu. Also look for any revisions of the board that you need to run the bigger cpu and make sure you have at least the revision shown. Althou you can't do it with most motherboards some can be flashed to run dual core cpus. If you are uncertain about flashing your bios you may want to go with the biggest cpu your current bios can handle because if you falsh the bios wrong or you have a power interruption during the flashing process you can ruin your motherboard.

Next time also list the laptop brand and model number.

You can almost never upgrade the processor on a laptop.

Does your computer have a CPU socket.

Will the BIOS support another processor?

What can I upgrade in a laptop?

http://www.computerhope.com/issues/ch000618.htm

CPU Upgrade

http://google.com/answers/threadview?id=544475

http://forums.tweaktown.com/archive/index.php/t-42...

http://forums.techguy.org/hardware/580816-laptop-p...

http://forums.extremeoverclocking.com/showthread.p...