You know how Honda sells Civics every year, but there are different generations of Civics besides just new yearly models? CPUs are like that too. A Pentium isn't the same as every other Pentium. Your motherboard supports a certain generation of Pentiums, this generation does not include the G4560. The G4560 is a new generation, which requires a new motherboard and new system ram. You will essentially be building an all new computer.