Default [Q] Canvas 2 and ninja a89 ...

I have a genuine question for all the tech savvys out there...


MY question is: We all know micromax a110 and a89 use the same board ie.Mt6577..But it has been seen that the a89 is suffering from heating issues while the a110 is not..I would like to know the reason of the problem..Also a solution to this problem will be appreciated..