watzup_ken
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But does the newer kaby lake CPU have better power management than the previous thus the better battery life?
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I doubt so. To be honest, Sky Lake, Kaby Lake and Coffee Lake are one and the same design differentiated by minor changes, including a slightly improved 14nm fab. Performance improvement is basically 0 if you are comparing these 3 processors at the same clockspeed. Performance improvement comes in the form of more aggressive clockspeed over the generations. I doubt you will find that the new processors will give you better battery life at load because Intel has been pushing the CPUs harder, thus, nullifying any improvements in thermal and power requirement.