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How to set SYSCLOCK to 400 MHz using STM32CubeIDE?

I am using a NUCLEO-H743ZI board. Using STM32CubeMX, I was able to set SYSCLOCK to 400 MHz like so:With STM32CubeIDE, it won't allow me to do the same:What should I be doing here instead?STM32CubeIDE has been really frustrating.

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edwin8 by Associate II
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STM32CUBEIDE Optimisation appears rather random

I have optimisation set to -o2 and every other Property and Preference is default. Processor is a H750. My code has a time critical inner loop which seems to vary from 14 up to 26 instructions for the same code, varying solely on the time of day when...

MikeDB by Lead
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