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This question about Package-on-Package RAM/CPU got me curious: My rPi B has the Samsung RAM packaged on top of the Broadcom (as I can read the Samsung product details off of the package). My rPi 2 B has the Broadcom on top of the RAM (as I can read the Broadcom product details off of the package). Is there a reason why the stacking order is different between versions, or is it different from batch-to-batch?

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The RAM on the Raspberry Pi 2 is not underneath the Broadcom chip, it's on the underside of the Pi.

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  • So they stopped doing PoP, do you know why?
    – Phil B.
    Commented May 7, 2015 at 15:51
  • I think it was a matter of cost. PoP is quite expensive.
    – recantha
    Commented May 7, 2015 at 20:08
  • PoP limited the memory to 500M because this was the largest package available.
    – Milliways
    Commented May 7, 2015 at 23:28
  • AIUI the reason for moving the memory to the bottom of the board is that the processor die was too big to fit in the PoP package.
    – Peter Green
    Commented Jul 8, 2016 at 23:07

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