Cpu replacement

[TXPLAYER05]

I am going to buy a Toshiba Satellite C855-S5233 laptop computer with an intel celeron C B820 cpu, so i read on newegg web page when I looked up this computer that the processor can be changed to a Core i5 processor specificly a i5-3210M Ivy Bridge one. I would like to know if this is possible to do before I purchase the actual Core i5 or i7 processor. I would really like to replace it with an Core i7-2630QM one but am not sure if it will work or not with the toshiba c855-s5233 motherboard even though it is a G2 socket processor and motherboard. Can someone help me with some helpful information...thanks, Jaime