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MSale.1
MSale.1
Senior
July 18, 2020
Solved

Is it possible to overclock the STM32H743 above 480MHz?

  • July 18, 2020
  • 8 replies
  • 2172 views

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This topic has been closed for replies.
Best answer by Tesla DeLorean

You'd set the clock ratios and flash wait states appropriately.

Depends on the part, but I'd expect most to get north of 500 MHz

8 replies

Tesla DeLorean
Tesla DeLorean
Guru
July 18, 2020

Yes

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waclawek.jan
waclawek.jan
Super User
July 18, 2020

is it wise?

RMcCa
RMcCa
Senior II
July 19, 2020

For production or a one-off? The reason stm lists a maximum is because that's a guaranteed maximum. You might find that the ability to over-over drive the chip is not consistent. Note that 480Mhz is already considered overdriving and is only available if you are using the LDO​.

Tesla DeLorean
Tesla DeLorean
Guru
July 19, 2020

Pretty sure the NUCLEO-H743ZI2 is using the SMPS

Not clear where the critical paths are, likely the prefetch out of the cache. Might also be some on the peripheral sides which also limit top speed.

The 400 MHz parts had a much higher ceiling, but ST hasn't really discussed the design issues with the H7 which seemed to take several years to get properly resolved.

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RMcCa
RMcCa
Senior II
July 19, 2020

I am just getting started with a h745. They are truly amazing chips and really make me wonder what sort of magic is going on inside. I'm particularly impressed with the real-time capabilities of the d2 domain. The block interconnect, dmamux and dmas makes the chip somewhere inbetween a microcontroller and an fpga.​

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