It's been a while since I posted. had been away for holidays and also work kept me busy. I found this information on Dynamics AX Support blog and thought it might interest you.
Read more here about the hardware sizing guide for AX 2012 R2
http://blogs.msdn.com/b/axsupport/archive/2014/05/30/ms-dynamics-ax-2012-r2-hardware-sizing.aspx
