Good day!

Welcome to Dell community Forum .

These are the processors which are designed to be compatible with this model  ,

Intel Core i7-2620M (2.70Ghz, 4MB)
Intel Core i5-2540M (2.60Ghz, 3MB)
Intel Core i5-2520M (2.50Ghz, 3MB)
Intel Core i3-2310M (2.10Ghz, 3MB)

Also would recommend you to purchase the processor from a Dell dealer so that you can purchase a processor compatible with the chassy.

I hope this help.If there are any further queries do reply to this community thread we will be glad to resolve them for you .

Have a great day ahead !

Kindest Regards,