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?

1 Answer 1


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

  • 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. Commented Jul 8, 2016 at 23:07

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.