02-06-2015, 05:27 PM
CPU clock speed is not the only contribution to processing speed. The newer generation Intel i7 used in the current model MBP is more efficient and even if it was at the same clock speed would be faster. But double, that has not happened in mobile x86 based CPU's from Intel or AMD over that time period. Based on Geekbench scores, the 2014 MBP is about a third faster than the 2012 model.