Will my gaming experience affected if I change into micro atx cpu ? I'm thinking of buying new rig and interested in micro atx

the only difference between the 2 is the motherboard which designates the form factor...

other than that..no difference... including gamin.

assuming that u r gonna use micro-atx casing, like any other casing, do check for air-flow. some micro-atx casings do have good air flow, while others dont. also check for space/clearance, some matx casing r big enuff to fit in big gc & hsf & multi hdds, while others are not. good luck & have fun