Laptops are difficult to upgrade, as are OEM computers. Especially for the CPU. I don't even know where you would be able to purchase a core i7 mobile. Nor would it be worth the cost. Why do you want to upgrade anyway?
I'll try to help you out though if you can link me to your computer model on the "support" section of the Dell website.
I want to upgrade my dell 1749 from a i5-520M to a quad core mobile i7,.. however i am unable to find out what chipset/socket it it has. is anyone able to help ,me out on that?
i have seen some core i7 for laptops on ebay. secondly i think it will work perfectly, if you had the option to upgrade it, on dell website, when buying your laptop. as these core i7 processors are new so there wont be much variations in them so i think it will work just fine. just to be sure, before installing the core i7, update your bios. the rest must be fine. hope i helped.