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You can reach 480MHz only for the following STM32H7 part numbers :
Note: For some parts, you need to check the maximum frequency from the datasheet.This is not enough! you also need to check the errata sheet. In fact, there is the following limitation :
Errata sheet STM32H743 : Errata sheet - STM32H750xB STM32H753xI - STM32H750xB and STM32H753xI device limitations There are 3 revisions:
VOS0 voltage scaling level is not available on silicon revision Y devices.This limits the maximum CPU frequency to 400 MHz.
Use silicon revision V devices to reach a maximum frequency of 480 MHz.
Open STM32CubeMX and create a new project for STM32H743xI/G.