It isn’t on-die, the ram is separate chips in the same package. See the pics about halfway down https://www.apple.com/de/newsroom/2023/10/apple-unveils-m3-m3-pr

It isn’t on-die, the ram is separate chips in the same package. See the pics about halfway down https://www.apple.com/de/newsroom/2023/10/apple-unveils-m3-m3-pro-and-m3-max-the-most-advanced-chips-for-a-personal-computer/ https://www.apple.com/de/newsroom/2023/10/apple-unveils-m3-m...