Turbo Boost multipliers with 1, 2, 3, 4 active cores (use base clock 133.3 MHz to determine frequency):
620M: 25 23
720QM: 21 18 13 13
Your pick of 2 faster cores or 4 slower cores.
620M has integrated GPU that is completely incapable of hardware video decode, likely useless for 3D, but probably is good for battery life, whereas 720QM does not.
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