I have 2 options,
1st one is intel i5 4200M 2.5Ghz (3.1 w/ Turbo Boost) 3MB cache
2nd one is intel i5 4200U 1.6Ghz (2.6Ghz w/ Turbo boost) 3MB cache
other specifications are all same;
8gb 1600mhz ddr3 ram
1tb hdd(i will add SSD later)
nvidia gt 740M 2gb 64bit video card
what do you think the difference between U and M model?