1, the CPU frequency is not the same. The highest frequency of m3 is 2.2GHz, the highest frequency of m5 is 2.7GHz, and the highest frequency of m7 is 3.1GHz.
2, the memory is not the same, m5 more than 8GB + 256GB of memory
3, the processor is different, m5 is i5 6210Y, m3 is i3 6000Y, m5 performance is better than m3.