Help finding CPU on Lenovo G50-70?

I have a Lenovo G50-70 and I was looking into upgrading it so I could better play games like CS: GO and Payday 2, but I can't seem to find the CPU.

Cpu is a square tile about a square inch and it needs to be in the airflow of the fan. Also it could be soldered into the motherboard.

Look under the fan under the heatsink lol the heatsink is big and square and looks sort of like a 4 sided radiator underneath it will be your cpu, central processing unit with some artic silver on it.