? You can't upgrade the CPU. It's a laptop. Your best option is to buy a desktop
Shows how much you know. You can EASILY upgrade a laptop CPU on this model. Only laptops with soldered CPUs (mostly just intel atoms) cannot be upgraded.
I upgraded mine ( inspiron 15r n5110) from an i3-2350 to an i7-2720qm. It runs a little hotter, with the fan on more but is super stable and quick as the proverbial **** off a shovel. I upgraded the TIM (mx-4) and run with turbo off mostly when I require cool quiet use, but even at full bore it only hits 70 C tops.