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i5 4670k running past 3.40GHz without overclock?

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July 25, 2013 9:18:16 PM

I recently built a setup with an Asrock extreme 6 z87 and an i5 4670k. I haven't overclocked it, or even changed anything in the UEFI. But for some reason, when I set power options to high performance or even balanced, the clock speed ramps up past 3.40GHz. It's actually been running like this for more than a week but I didn't notice till today. I've been monitoring temperatures the entire week and never noticed it go past 70C so I didn't make much of it.

So basically, why under high performance does my CPU go past the 3.40GHz it's supposed to be max out at? Also, even on balanced when I boot up it goes past the max for a few minutes but then settles down a little later.

EDIT: Should note that the highest i've seen it ramp up to was 3.70GHz or so. Although i've only monitored it for an hour or so. After I changed to balanced it seems to idle a lot more and goes under .80GHz when I'm not doing anything. But the question remains, high performance somehow overclocks the CPU? Or what?

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a b K Overclocking
a b à CPUs
July 25, 2013 9:20:03 PM

Your CPU has turbo up to 3.8Ghz I do believe. That is the reason you see this.
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a b K Overclocking
a b à CPUs
July 25, 2013 9:25:00 PM

kirilmatthew said:
Your CPU has turbo up to 3.8Ghz I do believe. That is the reason you see this.


This. The default setting for the i5-4670k is a base clock of 3.4ghz and a max turbo boost clock of 3.8ghz. The cpu will also underclock itself by default when its not being taxed (aka browsing, word, etc).
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a c 105 K Overclocking
a c 227 à CPUs
July 25, 2013 9:26:13 PM

^ This is correct.

Turbo is an automatic overclock built into newer processors. It's based on load and heat. Basically with all 4 cores active your CPU run at 3.5Ghz. With 3 cores active 3.6Ghz, 2 cores 3.7Ghz and with only a single core active it maxes at 3.8Ghz.

This is automatic and not the same as overclocking yourself. No special cooling is required.
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July 25, 2013 9:27:26 PM

fudoka711 said:
kirilmatthew said:
Your CPU has turbo up to 3.8Ghz I do believe. That is the reason you see this.


This. The default setting for the i5-4670k is a base clock of 3.4ghz and a max turbo boost clock of 3.8ghz. The cpu will also underclock itself by default when its not being taxed (aka browsing, word, etc).


So would keeping power options on high performance all the time be a bad idea? Is balanced good for all purpose use? Should I switch to high performance when I'm gaming or conducting a physically demanding task?
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