Intel i5 on chipset HM70

Hello, i have an hp 650 with chipset hm70 express and intel b820; the same notebook there is also with chipset hm75 and intel i5 3210m.

Now i should install the i5 3250, must i change also the chipset ? or can i change only the processor ? (i think that i cannot change the chipset, it's soldered to mainboard).

thanks