There seems to be 2 different version of the SoC, B and C https://hackaday.com/2020/11/11/adventures-in-overclocking-which-raspberry-pi-4-flavor-is-fastest/ ht

There seems to be 2 different version of the SoC, B and C https://hackaday.com/2020/11/11/adventures-in-overclocking-which-raspberry-pi-4-flavor-is-fastest/ https://hackaday.com/2020/11/11/adventures-in-overclocking-w... But I don't have any 4 right now, so I can't try it out.