I'm also unable to configure the HSI to get the system running above 96Mhz with STM32F765 . I'm using the system clock config generated by CubeMX.

Hi @Roach, I have a custom board that has the STM32F765 and running into similar issues as you did (system crashes on boot when configuring the system clock to max value of 216 MHz). I have tried with 8Mhz and 25Mhz crystals as the HSE, also powered ...