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Turbo Boost setting in mobo ?

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Mike99 View Drop Down
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    Posted: 22 May 2020 at 12:39pm
I have a B365M Pro4 mobo and it has more bios settings than I've ever seen! The CPU is an Intel i5-9400 with a base frequency of 2.90GHz and Maximum Turbo Frequency of 4.10GHz

The only thing I've seen regarding Turbo Boost is in BIOS > Advanced > OC Tweaker. It lists the following:

Target CPU / Cache / BCLK Speed: 4100 MHz / 3800 MHz / 100.0000 MHz

Target AVX2 Speed: 4100 MHz

Target Memory Speed: 2133 MHz

This looks like the 4100 MHz Turbo Boost is enabled.

But under "CPU Configuration"
Boot Performance Mode = Max Non-Turbo performance

The description says "it will keep CPU Flex-ratio till OS handoff." There is nothing in the manual that clarifies what that means. I'm guessing it means Turbo is not enabled during Boot. Is that correct? Should I leave that setting alone?

As a side question, why does the memory speed indicate 2133MHz when the RAM is 2666 MHz?
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