I'm on a budget build but the reason I consider the b150a is because I want to know the difference between b150a and b150m? b150m looks smaller? why is that? is there a significant improvement if I buy the b150a? and the reason why I consider msi h110m eco is that it will optimize the computer to utilize more but consume less something like that and will it lessen the electricity bill compare to the gaming mobos? Thanks guys