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I have a Kaby Lake i5-7400 CPU on a Gigabyte GA-Z170XP-SLI motherboard. Recently, I decided to delve into overclocking, and found that I was able to increase the CPU multiplier from the default of 30 to 33 then 35 without stability issues. CPU benchmark seems to reflect appropriate speed increases, so all seems well. (CPU-Z Screenshot)

My question is, how is this possible? Everything I read seems to suggest that only the "K" Intel CPUs have an unlocked multiplier, and mine is definitely not a "K" series CPU.

Am I doing something wrong? Should I change the multiplier back to 30 and use BCLK to overclock?

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    Apparently, non-K CPUs are capable of "turbo boost" which acts like automatic, on-demand overclocking. Perhaps, when I increased the multiplier, it's forcing the CPU into constant turbo mode? – Nick Feb 25 '18 at 17:13
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This is interesting, you are not supposed to be able to overclock it, but if it works, and it's stable, and you know the risks in over clocking, no reason not to.

From chatter on the Internet it appears that some of these units - with older microcode can be overclocked - so you probably want to make sure you don't update the microcode if this ability is important to you.

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    I routinely install all Windows updates, and the BIOS/UEFI firmware is also up to date. Have not installed a dedicated Intel microcode update, but I believe these were included in the recent windows update patches. Thanks! – Nick Feb 25 '18 at 17:10

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