Hi i am trying to understand why my Task Manager shows two different CPU speeds: 3.18 Ghzand 2.21 Ghz. Is there maybe something wrong in my configuration? This is a Surface Pro 4 I7
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1Can you post a screen shot?– tyelfordDec 19, 2015 at 12:47
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Two cores, each currently at a different speed?– Xen2050Dec 19, 2015 at 14:00
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@Xen2050 It's not the different cores, windows only shows one speed for the cpu.– JamesRyanDec 19, 2015 at 14:45
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1 Answer
The latest Intel CPUs dynamically change clockspeed both for energy saving and to boost cores depending on load.
A lot of programs are single threaded so it can either boost all four cores a little bit or a single core a lot to fill it's temperature headroom.
Windows doesn't show the individual core speeds.(If you right click on the graph you can 'change graph to' 'logical processors' to see the cores) The two speeds you see are the standard base speed in the name so for an i7-6650U is 2.21GHz and the other speed is what it is currently running at up to 3.4Ghz for this chip. If you close your apps then you'll see it go lower.
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Not just the latest Intel CPU's, it's been on Intels and AMD's since 2003, maybe even 2000. See en.wikipedia.org/wiki/Dynamic_frequency_scaling– Xen2050Dec 19, 2015 at 15:15
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@Xen2050 you are right but the Microsoft Surface uses an Intel CPU Dec 19, 2015 at 22:01